Tag Archives: anal swabs

Nylon Flocked Swab Sample Kit

Nylon Flocked Swab Sample Kit

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Nylon Flocked Swab Sample Kit

Our sterile CellMedical® flocked nasopharyngeal swab provides excellent specimen absorption and elution EO sterilized and individually packaged in peel pouches 100% Made in the USA Nylon flocked tip 6″ overall length with 0.7″ long flocked tip.

Nylon Flocked Swab Sample Kit

Nylon Flocked Swab Sample Kit

Why Flocked Swabs Provide Superior Specimen Collection

Product Description

TECHNICAL FEATURES
INDICATIONS FLOCKED SWAB(Nasopharyngeal and Throat)
Material Nylon Flocked tip, oral type with ABS handle, nasal type with pp handle
Specification
  1. Nasopharyngeal Type    2) Throat Type
Length of Handle 151cm+-1cm
Break Point Nasopharyngeal swab:8cm / Throat swab: 3cm
Cotton Specification Nasopharyngeal swab flocked part: 2.5cm length/3mm diameter
Throat swab flocked part:2.2cm length/6mm diameter
COMPLIANCE TO STANDARDS Directive 93/42/EEC. Class IS medical device.
Compliant to ISO EN 13485: 2016
PACKING
EXPORT PACKING 1pcs/blister, 100pcs/bags, 100bags/carton, carton:60x40x48cm
STORAGE Temperature: 0÷+40ºC Relative Humidity: 20%÷80%
EXPIRY EO sterilization and 5 years from production date indicated on the package
                            Other Opitional
Model       Technical Feature Package
NLD602-1  Flocked Swab With Tube 100 pcs/bag, 20 bags/carton, carrton:44X37X34cm
                            DESCRIPTION
disposable use, destroyed after use
Pls donnot use it if expired or package damage
What Is Specimen Collection ?

What Is Specimen Collection ?

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The surge of covid-19 has seriously affected our life and production.

With the efforts of most scientific researchers, the test of this virus came out.

Collection methods of common virological test specimens.

Nasal Swab Virus Sampling Kits

Nasal Swab Virus Sampling Kits

1. Draw 5 ml of blood for serological examination without anticoagulation

2. Extract cerebrospinal fluid through an aseptic procedure, place it in a sterile test tube, and immediately send it for examination in an ice bath.

3. Take a cervical or vaginal swab to take the secretions from the lesion site.

If there is no lesion site, clean the mucus of the cervical mouth, stick the swab about 1 cm into the cervix and hold it for more than 5 seconds to take it out. And put the swab in the transport solution on the ice at 4 °C. 

4. Fecal specimens Take 2g~4g of stool specimens in a sterile container, add 8ml~10ml of transport fluid, and send them for inspection immediately.

5. Gargle solution: The patient can get it by gagling with sterile normal saline several times. After mixing the same amount with the transport solution, send it for inspection immediately.

6. Throat swab: Use a tongue depressor to fully expose the throat to avoid saliva contamination. Use a swabened moist with normal saline to collect specimens on the surface of the throat, and place them in transport fluid for inspection.

7. Nasopharyngeal swab: Take nasopharyngeal secretions for bacterial culture and drug sensitivity test.

7. Urethral swabs and urine specimens.  The tester inserts the urethral swab 4 cm into the urethra and rotates it gently 2 to 3 times to obtain more epithelial cells. Then take it out and send it to the transport fluid for inspection.

The classification of new coronavirus nucleic acid samples includes nasopharyngeal swabs, oropharyngeal swabs and anal swabs. Different specimens use different methods for specimen collection.

What is a Specimen Collection Kit?

 Viral Transport Kit: for collecting, handling, and transporting specimens suspected of VIRUS.

Generally equipped with a disposable flocking swab. From the appearance point of view, the flocking swab is white and soft. Using this soft brush during the sampling process will make the user feel no foreign body, and it is suitable for sampling in different parts. people.

Virus sampling tube: When collecting samples, routine samples could not be detected by PCR immediately. It is generally necessary to transport the swab sample with the specimen. The virus itself dissolves rapidly in vitro, affecting subsequent experiments. For transport, viral transport medium must be added.

What is the Specimen Collection Kit used for?

How Accurate Is The Nasal Swab

 The nasopharyngeal swabbing is generally the preferred method of specimen collection for COVID-19 testing.

1. Disposable virus sampling tube is used for monitoring and sampling infectious pathogenic microorganisms in the disease control part and clinical part. Suitable for sampling influenza virus (common influenza, highly pathogenic avian influenza, H1N1 influenza virus, etc.). Hand, foot and mouth disease virus and other types of viruses.

It can also be used for sampling other respiratory diseases such as Mycoplasma and Chlamydia. COVID-19.

2. For transporting nasopharyngeal swab samples or site-specific scheduled samples from the sampling point to a testing laboratory for extraction and testing by polymerase chain reaction.

3. For the preservation of nasopharyngeal swab samples or samples arranged at specific sites for necessary cell culture.

Swab in specimen collection

1. Swabs with polyester fibre, polyester or rayon head and plastic or aluminium handle: suitable for the collection of virological test specimens. The collection of virological test specimens should not use swabs with wooden handles.
2. Cotton swabs: It is suitable for the collection of vaginal, cervical and urethral specimens for the mycoplasma test. It is not suitable for the collection of bacteria (especially fastidious bacteria) and chlamydia test specimens.
3. Polyester swabs and nylon swabs: suitable for a sampling of virus and bacterial specimens.
4. Flocked swab: It is made of nylon fiber through proprietary spray technology, and is suitable for respiratory virus sampling and fungal culture specimen sampling.
5. Calcium alginate swab: suitable for the collection of nasopharyngeal swabs for Chlamydia and Bordetella pertussis.

However, it is not suitable for the sampling of lipid-enveloped virus and cell culture. It is not suitable for the sampling of Neisseria gonorrhoeae and Ureaplasma urealyticum.

Why Choose Anal Swab Covid Tests

Why Choose Anal Swab Covid Tests

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Why Choose Anal Swab Covid Tests

A friendly netizen said,

“The anal test first asks you to take off your pants and lie on the bed,

The paramedic then stabs (anus) twice with an anal swab,

shallow once deep

In addition to the endless shyness in the whole process,

Nothing else feels like it! ”

A shy handsome man

A shy handsome man

 

Xiaolee will tell you why you need to do anal swabs.

Currently screening for COVID-19,

Mainly use an oropharyngeal swab and nasopharyngeal swab nucleic acid detection,

Because of its convenience and speed, it is suitable for large-scale screening;

Nasopharyngeal Swab Sample

Nasopharyngeal Swab Sample

However, some asymptomatic or mildly infected people,

The disease recovered quickly after infection,

Nucleic acids in the respiratory tract and pharynx are undetectable within 3-5 days.  

longer duration of nucleic acid-positive stool or anal swab,

Therefore, adding anal swabs can improve the detection rate,

Effectively reduce the probability of false negatives,

Reduce missed diagnoses!

One of the anal swab sampling poses

One of the anal swab samplings poses

 

Friends who have done nucleic acid swab tests have experience,

In previous tests,

The most uncomfortable part should be the part of the nasopharyngeal swab,

To poke the nose is to poke deep into the soul.

According to the description of the anal swab recipient,

“The whole process was lying in bed and the medical staff helped.

Insert the tip of the sampling cotton swab into the anus and turn it a few times.

Twice in total, each for about 10 seconds.

Although a little surprised and a little embarrassed,

But understandable and bearable,

After all, this rule is for everyone’s sake. ”

Many Chinese friends who have returned to China for quarantine

I have also experienced the subtle taste of it.

 

 

How to Swab For Covid Test

How to Swab For Covid Test

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How to Swab For Covid Test

Since the outbreak of novel coronavirus pneumonia, we must have experienced nucleic acid testing. Covid swab test Nucleic acid detection plays a very important role in the process of infection diagnosis of COVID-19. It can not only find asymptomatic patients in the incubation period as much as possible but also greatly reduce the risk of infection.

Nucleic acid detection is so important. Next, Dr Li will take you to have an in-depth understanding of the relevant principles of nucleic acid detection, the difference between mixed collection and single collection of nucleic acid detection, and the matters needing attention in nucleic acid detection, to help you better protect yourself while popularizing knowledge.

To understand nucleic acid detection, we must understand the detection principle. Let’s take a look at its detection principle first.

The doctor is testing the patient's nasopharynx swab

The doctor is testing the patient’s nasopharynx swab

What is the principle of nucleic acid detection?

Nucleic acid, the genetic factor of the virus, is a macromolecular chain composed of four nucleotides. Different molecules represent different nucleotides and form a long chain. Nucleic acid detection is through the detection of nucleic acid in the chain, and this segment of nucleic acid is COVID-19 specific, other viruses do not.

Pcr test nasal swab and an antigen test difference for covid 19

Pcr test nasal swab and an antigen test difference for covid 19

The substance detected by the nucleic acid is the nucleic acid of the virus. At present, the detection technology is mainly through PCR (polymerase chain reaction) technology to detect the nucleic acid of the virus. During the detection, the nucleic acid chain of COVID-19 was used as the detection target, and the target gene sequence was amplified by PCR Test, which was combined with a fluorescent labelled probe added in the test reagent to produce a fluorescence signal.

The three forms of nucleic acid detection have their advantages.

Nasal swab test

This test method is to insert the test swab vertically into the nostril. And gently rotate the swab, stay in the nasal cavity for about 15 seconds, to test.

Flocked Tip Swab Nylon Sterile Nasal Swab Stick

Flocked Tip Swab Nylon Sterile Nasal Swab Stick

Compared with throat swabs, nasal swab testing is more accurate for inexperienced testing personnel. And the risk of exposure is lower. However, it is not suitable for some patients with nasal allergies, high blood pressure and people who take anticoagulation and antiplatelet for a long time.

Throat swab test

At present, the most widely used detection method is also a form that is often used by everyone. During the sampling process, the patient opened his mouth and made an “ah” sound, and the testing personnel used a sterilized cotton swab to gently and quickly wipe the pharyngeal lateral wall and posterior pharyngeal wall of the subject many times.

COVID-19 Testing:PCR swab test,antibody test, and antigen test difference

COVID-19 Testing: Throat swab test

Throat swab testing: Often used in the testing process because it is more convenient and fast to collect, and it is more acceptable to the public, but the risk of exposure is also greater.

Anal swab test

This test method is a method of inserting a test swab into the anus and taking a sample at the fold of the anus or taking a sample at 2 to 3 cm for a new coronavirus test.

Many patients reject anal swab testing, but anal swabs can improve the accuracy of testing for new coronavirus infections to a certain extent. Some patients indeed have negative throat swabs, but positive ones are detected by anal swabs. In some patients, the anal swab test was still positive after the other two tests turned negative.

Anal swab

Anal swab

Why do multiple nucleic acid tests need to be performed?

Multiple nucleic acid tests are necessary for epidemic prevention and control.
A negative nucleic acid test does not mean that the tested person is not at risk of infection. Any detection method has the possibility of errors, especially in high-risk areas. To ensure the accuracy of the inspection results and better prevent and control the spread of the epidemic, multiple rounds of inspections must be carried out. There are also the following reasons for taking multiple rounds of detection:

After virus infection, the human body has a certain value-added period. When testing, if the virus in the body does not reach a certain concentration, we may not detect the virus.

When the specimen was collected, due to the different sampling methods, no virus cells were collected. False-negative specimens can also lead to inaccurate collection results.

Errors in the transportation process and storage of samples for inspection will also affect the results of nucleic acid testing.

Therefore, for risk areas and special populations, multiple rounds of nucleic acid testing must be carried out to more accurately and effectively detect the virus source, so as to better and more accurately prevent and control and identify infected people, and cut off the source of the virus. No matter what kind of inspection process, attention must be paid.

Covid-Nucleic-Acid-Test

Covid Nucleic Acid Test Nasopharyngeal Swab Test

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This article
To talk to you in detail
Covid nucleic acid test!

But in the face of the “nucleic acid swab test”
This unfamiliar and familiar word
Do you have many questions?

Image source network

Do you want to do a nucleic acid test when you go back?

Will it be difficult to make an appointment for nucleic acid testing?

How long does it take to get the results of a nucleic acid test at the hospital?

Should I Swab My Throat or Nose for Rapid COVID-19 Tests?

To answer your questions.
Today.
I’m going to tell you.
Those things about nucleic acid testing.

01. What is nucleic acid detection?

At present, nucleic acid detection is the main method for laboratory diagnosis to determine whether a patient is infected with the new coronavirus. It can achieve early detection, early diagnosis, and early treatment. Real-time fluorescent PCR can be used to detect throat swabs, sputum or blood samples. to covid nucleic acid, or detected by viral next-generation gene sequencing.

simply put

Nucleic acid testing is done by

After collecting human secretions

Tested by the instrument

to see if we have the new coronavirus in our body

If so, the test result is positive

On the contrary, if it doesn’t, it’s negative.

02. How to test the COVID swab?

“Sir, oropharyngeal swab, nasopharyngeal swab, and anal swab, which one to choose?”

How do you do a nasopharyngeal swab?

Nasopharyngeal swabs must be performed with the patient sitting upright with the head in an upright position, as this allows for easy visualization and access to the nasal floor perpendicular to the central axis of the patient’s face.

Flocked Tip Swab Nylon Sterile Nasal Swab Stick

Flocked Tip Swab Nylon Sterile Nasal Swab Stick

Insert the swab into the patient’s nose and align it parallel to the nose and the base of the septum. As long as there is no obstruction in the nasal cavity, the swab continues to move in this direction until it reaches the nasopharynx, at which point the tester feels resistance.

Once the swab reaches the nasopharynx, a gentle rotation and two complete 360-degree rotations are recommended to allow secretions from this area to be absorbed.

Once the swab is removed from the patient’s nose, it is immediately inserted into a viral sample containing a viral transport medium. The handle of the swab extending through the opening of the vial was broken off to allow the tube to be closed.

So
Now that there are oropharyngeal swabs and nasopharyngeal swabs
Why add anal swabs?
To answer your questions
Let’s take a look at their respective advantages and disadvantages

The specific operation of the anal swab is as follows:

Soak a flocked swab in saline, insert it 2-3 cm into the anus, wipe from the folds around the anus, or rotate it gently inside the anus, and insert it into a test tube containing saline.

anal swabs

For fecal swab cultures, all of the above requires the use of sterile equipment and placing the swab in a sterile tube.

So
Now that there are oropharyngeal swabs and nasopharyngeal swabs
Why add anal swabs?
To answer your questions.
Let’s take a look at their respective advantages and disadvantages.

Oropharyngeal swab: relatively simple to operate, less irritating, suitable for large-scale screening. Therefore, the nucleic acid test of oropharyngeal swabs is mainly used in the screening of new coronary pneumonia for the epidemic-related population, which is used in the routine nucleic acid test clinic of the First Affiliated Hospital of NTU.

Nasopharyngeal swab: The technical requirements are high, the human body does not feel comfortable, and the accuracy rate is higher than that of the oropharyngeal swab. However, for some asymptomatic or mildly infected people, the condition recovers quickly after infection, and the pharyngeal nucleic acid may not be detected in 3 to 5 days.

Anal swab: high accuracy, reduce missed diagnosis. The study found that the duration of nucleic acid-positive feces or anal swabs of some infected persons is longer than that of the upper respiratory tract. Therefore, anal swab tests will be carried out for key groups such as isolation points or some imported overseas.

In conclusion.
The three swabs have different lengths.
If you have to test an anal swab.
Don’t be shy.
Whatever the swab,
It is a good swab that can accurately identify the virus.

 
Oropharyngeal Throat Swab Manufacturers

Oropharyngeal Throat Swab Manufacturers

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Oral Swab Stick

Oropharyngeal Throat Swab Manufacturers

Name: Oropharyngeal swabs individually packaged

Contents: Oropharyngeal swab 150mm*1

Material: Cotton Swabs: Nylon Flocking Fiber

Swab stem: Medical grade plastic ABS handle

Availability: Can be paired with UTM/VTM

MOQ: 10,000 pieces

 

 

 

Product manual:

To ensure that the cotton swabs collect more samples, we replaced regular cotton swabs with the nylon flocking technology.

The ABS material used has a great effect on resistance.

Such materials have high-temperature resistance, high tensile strength, wear-resistance and low cost.

Oropharyngeal flocked swab size

Oropharyngeal flocked swab size

There is an obvious breakpoint about 3 cm in the front, which is convenient to be placed in the preservation solution for storage and transportation.

Description of Oropharyngeal Swab:

Wash your mouth before use and stop eating within half an hour.

Gently rotate 3-5 times in the oral cavity.

Throat swabs were removed from 3 cm.

Place a cotton swab into a test tube with Universal Delivery Medium.

Precautions:

Try it for one person only.
Do not open the package at will, so as not to pollute the environment.
To prevent cross-infection, use the swab carefully.

Flocked Nylon Swabs and Non-Flocked Rayon Swabs

Flocked Nylon Swabs and Non-Flocked Rayon Swabs

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Flocked Nylon Swabs and Non-Flocked Rayon Swabs

Flocked swabs are famous for their stable and reliable performance and excellent absorption and elution ability.

Type of sampling swab.

1. Polyester fiber, polyester or rayon head, plastic or aluminum handle swab: it is suitable for the collection of virological test specimens. Swabs with wooden handles should not be used for the collection of virological test specimens.

2. Cotton swab: it is suitable for the collection of vaginal, cervical and urethral samples for Mycoplasma test, but not for the collection of bacteria (especially caustic bacteria) and Chlamydia test samples.

3. Polyester swab: suitable for sampling virus and bacterial samples.

4. Flocked swabs: made of nylon fibers by proprietary spray technology, suitable for sampling respiratory viruses and fungal culture samples.

5. Calcium alginate swab: it should be used for the collection of Chlamydia and botulinum pertussis nasopharynx swab. However, it is not suitable for the sampling of lipid coated virus and cell culture, Neisseria gonorrhoeae and Ureaplasma urealyticum.

Specimen Collection Swab.

Why choose flocked material as sampling swab material? What are its characteristics？

The unique test substrate greatly improves the yield of DNA;

Adult oral SWAB piece 1 to 10 μ g DNA;

It is a good alternative to blood collection;

Both human and animal can use it;

Simple and fast operation;

There are two types of single and double disinfection packaging to choose from;

application;

Genotype study;

Veterinary genotyping and diagnosis;

Parent child and genetic services;

Forensic and DNA population studies;

 

Flocked Dacron Swabs

Flocked Dacron Swabs

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Flocked Dacron Swabs

Manufacture Sell Nasopharyngeal Nasal Oral Medical Sterile Flocked Collection Testing dacron swab.

The flocked sampling swabs usually apply asterile dacron or rayon swab with a flexible, plastic shaft that can be easily cut off after thesampling of specimens and put into thetransportation storage tube for storage. Thematerial from the flocked swabs is dispersed into the liquid medium.

Which is better, Tradition swab or flocked swab?

Dacron swab and PBS are acceptable alternatives to flocked swab and viral transport media for SARS-CoV-2 Nasopharyngeal flocked swabs placed in viral transport media (VTM) are the preferred collection methodology for respiratory virus testing.

Looking for more?Flocked swabs definition Here.

Flocked Dacron Swabs-Nasopharyngeal Swab

Flocked Dacron Swabs-Nasopharyngeal Swab

Specification
Material
nylon fibers+medical grade ABS stick
Length
150mm
Breakpoint Length from tip
80mm or 30mm
Handle dia.
1.8-2.5mm
Flocked tip
25mm
OEM/ODM
Available
Sample time
3days
Delivery time
20days
Certificate
CE&ISO13485

1. Sampling is more comfortable and convenient.

Our company uses the existing technology “spraying technology” to vertically attach millions of nylon flocked micro fibers to the head of medical grade handle through the flocking process of electrostatic charge. The function of vertical nylon fiber is similar to that of soft brush. Using this soft brush in the sampling process makes the user feel no foreign matter. At the same time, the flocking swabs used in different parts adopt different breaking points, and the rod adopts different thickness to make the softness different.

For example, nasal swab, its upper end of the rod is thinner and softer, and its breaking point is longer.

Sterile Flocked Nylon Swab with 80mm Breakpoint.

2. Flocking swab samples release more.

The capillary action between nylon fiber bundles promotes the strong hydraulic absorption of liquid samples. The sample remains on the surface to make elution easier. In the traditional cotton swab, most of the samples collected are still captured in the fiber matrix of the head, which is not easy to release or the release amount is small. Flocked swabs have been shown to release up to 95% of the sample, compared with 25% for standard fiber pointed swabs. If the sample size is particularly small, the use of flocking swabs is particularly important.

3. Flocking swab has biocompatibility and is an ideal choice for PCR.

In order to limit the damage to the sample and improve the accuracy of detection, disposable sampling swab is made of better quality nylon flocking swab.

This makes flocking swabs an ideal choice for PCR Swab Test. Therefore, for scientists using PCR technology, the new flocking swab is PCR compatible and does not contain RNase and DNase.

How are flocked swabs used for specimen collection swab?

Our flocked swabs feature perpendicular nylon fibers that optimize specimencollection and elution into transport media. The swabs also feature a moldedbreakpoint that allows you to safely and easily break off the swabstick, and severalbreakpoint options are available for different tubes.

Packaging & Delivery

Selling Units:
Single item
Single package size:
16X1.5X0.5 cm
Single gross weight:
0.005 kg
Package Type:
100pcs/bag,10000pcs/ctn,ctn size:60*40*48cm,10kg/ctn.
Lead Time:
Quantity(Pieces) 1 – 10000 >10000
Est. Time(days) 15 To be negotiated
Is anal swab nucleic acid test more accurate than nasopharyngeal swab?

Is anal swab nucleic acid test more accurate than nasopharyngeal swab?

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Is anal swab nucleic acid test more accurate than nasopharyngeal swab?

Nucleic acid detection:generally carried out by sampling pharyngeal swabs in the nasal cavity and oral cavity.

Now began to increase the anal swab test, we are also curious about this test method. So, is anal swab nucleic acid detection more accurate than nasopharyngeal swab? How to sample for anal swab test?

Is the nucleic acid detection of anal swab more accurate than that of nasopharyngeal swab?

In the screening of New Coronavirus pneumonia, we mainly used the oropharyngeal swab nucleic acid test. Because the reason is convenient and quick, suitable for large-scale screening. The accuracy of nasopharynx swab for new crown nucleic acid detection is higher than that of oropharyngeal swab, but the human body feels uncomfortable.

In last year’s test, researchers found that many infected people had negative pharyngeal nucleic acid.But their anal swabs were still positive for longer.

The combination of the two in nucleic acid detection can improve the detection rate and reduce the proportion of missed diagnosis.

However, anal swab sampling is inconvenient and not suitable for large-scale screening and testing in the community.

For some asymptomatic or mild infections, the condition recovers quickly after infection. And the pharyngeal nucleic acid may not be detected in 3 to 5 days.

The researchers found that the duration of nucleic acid positive in feces or anal swabs of some infected people was longer than that in the upper respiratory tract.

Therefore, increasing anal swab nucleic acid detection can improve the detection rate of infected patients and reduce missed diagnosis.

Although nucleic acid detection has the advantages of high sensitivity and short detection cycle, it also has some disadvantages.

Different from the direct isolation of live virus from human body, nucleic acid detection adopts an indirect method, which may cause false negative.

Anal swab & test tubes

Anal swab & test tubes

How to sample for anal swab test

1. Soak the swab in normal saline, insert it into the anus of 2-3 cm, wipe it from the folds around the anus, or rotate it gently in the anus. And then insert it into the test tube containing normal saline.

2. For fecal swab culture, all the above operations require the use of sterile equipment and the swab into a sterile test tube.

anal swab

Sample collection swab :How much do you know about nucleic acid testing

Sample collection swab :How much do you know about nucleic acid testing

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Sample collection swab:How much do you know about nucleic acid testing

The spread of the covid-19  is continuing worldwide. Although the global scientific and medical circles are making every effort to fight the epidemic, it is difficult to predict how the epidemic will develop in the future, and its impact on social development has appeared in many aspects.

Currently, COVID-19 cases are over 220 million.

Currently, COVID-19 cases are over 220 million.

In order to fully control covid-19, the general screening of local areas shall be carried out if necessary.

After identifying the detection object, how to detect it?

1、 What specimen to choose?

According to the recommendations of the American infectious diseases association, the following specimens were used:

The sensitivity of simple oropharyngeal swab may not be enough, so it is relatively easy to miss diagnosis.

The sensitivity of alveolar lavage fluid is the highest, but it is obviously not suitable for universal screening.

Nasopharynx swabs and other operations should also be standardized.

Improper operation may make the quality of collected samples not high, thus increasing the risk of missed diagnosis.

2、 Select the time of detection

It is very important for COVID-19 to measure RNA and choose the right time. One analysis included 7 studies, including 2 unpublished reports, to evaluate the detection efficiency of RT-PCR at different time points after exposure to virus :

On the day of exposure to the virus, the possibility of detecting viral RNA is almost zero;

On the fifth day after exposure, that is, the first day after infection, the detection probability was 62%

About the 8th day after exposure, i.e. the 4th day after infection, the probability of detection was 80%

On the 21st day after exposure, i.e. the 17th day after infection, the detection probability was 34%

In conclusion, exposure to COVID-19 may require multiple tests to avoid missed diagnosis. However, it is not recommended to repeat the test within 24 hours of the previous test; The interval between two tests shall be at least 24 hours.

After 28 days of exposure to the virus, if the infection has not been diagnosed, it is not necessary to continue the detection; At this time, it is almost certain that it is not infected.

Nucleic acid detection throat swab  sampling process

The COVID-19 nucleic acid was novel coronavirus, which was collected from sputum or lower respiratory tract by real-time fluorescent RT-PCR. If positive, the new coronavirus could be diagnosed. This is the basis for the diagnosis of new type of pneumonia. In addition to detecting the nucleic acid of the virus, it can also detect whether the virus in the specimen is highly homologous with New Coronavirus. If so, it can be diagnosed as New Coronavirus pneumonia. The virus is highly infectious and has the characteristics of human to human transmission, but the virus is sensitive to temperature and sunlight and ultraviolet rays.

Sample collection, nasopharyngeal swab sampling

Sample collection, nasopharyngeal swab sampling

Sample collection, Oropharyngeal swab sampling

Sample collection, Oropharyngeal swab sampling

The flocked swab is the best raw material for sampling swabs.

 

 

reference

1，Infectious Diseases Society of America Guidelines on the Diagnosis of COVID-19, updated December 23, 2020. https://www.idsociety.org/practice-guideline/covid-19-guideline-diagnostics/ (Accessed on January 14, 2021).

2，Kucirka LM, Lauer SA, Laeyendecker O, et al. Variation in False-Negative Rate of Reverse Transcriptase Polymerase Chain Reaction-Based SARS-CoV-2 Tests by Time Since Exposure. Ann Intern Med 2020; 173:262.