Are you like me who didn't know what a pharyngeal swab was before the outbreak? Are you also wondering why a pharyngeal swab nucleic acid test is used for NCC testing instead of a blood test? Can't the blood test detect it? Isn't it said that New Crown can also be detected in blood and stool as well?

Today, let's take a look at why neointestinal swabs are used for nucleic acid testing of the new coronavirus.

Since the outbreak until now, the test used to screen for Neocon infection has been the pharyngeal swab nucleic acid test. Initially, our scientists used oral/nasopharyngeal swabs to collect specimens for virus detection, but with the continuous in-depth research and understanding of the new coronavirus, we found that in addition to nasopharyngeal swabs, sputum and other lower respiratory secretions, blood and stool specimens can be detected in the new coronavirus, so why is blood testing not used for the new coronavirus?

What role can blood tests play in the new coronavirus? Every time you go to the hospital, blood test is an essential test in clinical diagnosis and treatment work. For the new coronavirus, blood tests can help doctors first identify whether it is a bacterial infection or a viral infection. If the patient's blood tests have a normal or reduced peripheral blood white blood cell count and a reduced lymphocyte count, then it is very likely to be a viral infection, and then combined with the patient's epidemiology and symptoms and signs, the doctor will be able to determine whether the patient is a suspected case of new coronavirus infection, and only then will there be a follow-up viral nucleic acid test .

So in this respect, blood tests can also be helpful in screening for neo-coronavirus. So why not use a blood test to detect neo-coronavirus? It can also reduce the chance of infection.

As we all know, the new coronavirus is mainly transmitted by droplet and contact, and the presence of ACE2 receptor in the respiratory tract, which is necessary for the invasion of the new coronavirus, makes the respiratory tract of the infected person the main gateway for the invasion of the new coronavirus, and therefore the infected person will develop pneumonia.

In the early stages of infection, if blood is used to test for nucleic acid, there is a high probability of false negatives, because the blood may not be infested with the virus in the early stages of infection. In contrast, pharyngeal swabs are the best choice for nucleic acid testing because they have the highest chance of obtaining a positive result when sampled from the nasopharynx, oral cavity, and other lower respiratory tract secretions. The current nucleic acid testing technology is a relatively mature testing method, which only requires a few seconds of swabbing in the throat to collect the specimen, allowing for early detection of the infected person and faster isolation and treatment to avoid widespread infection.