What is a Nasopharyngeal Swab?
COVID-19 Nucleic acid swab test is a very effective and effective measure to prevent and control the new crown pneumonia epidemic.
The upper respiratory tract of human body includes nasal cavity, pharynx and throat.
That is to say, if people are infected with COVID-19, they can extract the nucleic acid of the virus in the nasal cavity, pharynx and larynx in 96 hours.
Therefore, we usually sample these locations in the rapid detection of new crown nucleic acids.
How to collect a nasopharyngeal swab?
Nasal swab sampling process
The first step is to collect secretions.
First, the medical staff will use a pharyngeal swab to wipe the subject’s nasal cavity or throat tonsils to collect salivary secretions.
nasal swab collection method
The second step is to reserve samples.
After collecting the sample, immerse the nasopharyngeal swab in the preservation solution and screw on the tube cover to retain the sample.
The third step is to send samples for inspection.
Then, put the samples into clean sealed bags and send them to relevant parts for testing.
The fourth step is nucleic acid extraction.
Relevant departments will send the samples to the designated laboratory for nucleic acid extraction experiment.
Step 5: fluorescent PCR nasopharyngeal swab.
After collecting nasal samples, the experimenter uses fluorescent PCR to detect whether there is amplification reaction.
That is, to judge whether it is negative or positive.
Step 6:Finally, Receive test report.
Finally, according to the fluorescent PCR reaction results of nucleic acid detection, the nucleic acid detection vehicle inspection report is obtained, and I can query the results.
Sampling swab material
The sampling swab used for nasopharynx collection consists of a narrow rod made of a short plastic rod, one end of which is covered with an absorbent material. Such as cotton, polyester or flocked nylon.
The swab used for virus sampling should directly contact the sampling part.
The material of the sampling head is closely related to subsequent detection.
And the material requirements of virus sampling swab will be very high.
The virus sampling swab head shall be made of polyester (PE) synthetic fiber or artificial fiber.
Forbidden to use calcium alginate sponge or wooden swab (including bamboo stick).
However, calcium alginate and wood components can also absorb proteins after immersion in the preservation solution, and even inhibit the subsequent PCR reaction.
What are the advantages of using flocked sampling Nasopharyngeal swabs?
1. Flocked swabs provide better sampling.
Flocking swabs are a good choice for rapid diagnostic tests because they can better collect cells or organisms at the collection site and ensure the rapid release of the whole cell.
2. Enhanced diagnostic sensitivity.
Professional flocked technology turns each fiber into a velvet like swab, thus creating hundreds of thousands of contact points to better collect and release the collected samples.
Compared with non aggregated swabs, the increase in the number of target cells helps to improve the sensitivity of rapid diagnostic tests.
3. Rapid elution.
Their stable and reliable performance and excellent absorption and elution ability.
4. Easy handling and transportation.
sterilized and packaged separately, and the sterile swabs.