Why are multiple rounds of nucleic acids available for testing?

Currently, nucleic acid testing is an important tool for early detection of infected individuals. This Omicron variant strain of the disease has a shorter incubation period, is more contagious and spreads faster than the Delta strain. Moreover, many residents are infected with no obvious symptoms, making it highly insidious. Nucleic acid testing is an important tool for early detection of infected persons. In the face of "abnormal" Rapid antigen nasal swab particles, large-scale nucleic acid testing and screening should be carried out as soon as possible, so as to cut off the transmission pathway as soon as possible and prevent the spread of the epidemic. The accuracy of single nucleic acid amplification test is lower than that of multiple nucleic acid tests. Currently, for the Omicron variant, nucleic acids need to be tested dynamically and repeatedly within a short period of time for effective detection. The accelerated encrypted nucleic acid amplification test is intended to identify "leaks" from the tens of millions of people and prevent outbreaks.

What is the difference between a throat swab and a nasal swab?

Currently, the main samples used for detection of coronavirus nucleic acid are as follows: nasopharyngeal swabs, oropharyngeal swabs, deep cough sputum, nasopharyngeal or airway extracts, and bronchial lavage fluid. Nasopharyngeal swabs and oropharyngeal swabs are the most commonly collected samples, but there are some exceptions.

It has been shown that the detection rate of neococcal pneumonia nucleic acid is higher in nasopharyngeal swabs than in oropharyngeal swabs because the nasopharyngeal cavity is relatively closed and the virus is more easily enriched. However, there are many factors affecting the accuracy of nucleic acid testing - in addition to sampling-related factors such as the sampling site, sampling technique, and the degree of cooperation of the person being sampled, there are also many non-sampling related factors, such as the site of infection of the infected person, the viral load, and laboratory testing techniques. The choice of sampling site is only one of them. Simultaneous collection of multiple samples such as oropharyngeal swabs and nasopharyngeal swabs can relatively improve the accuracy of nucleic acid testing. Whether it is an oropharyngeal swab or a nasopharyngeal swab, the most important thing is that the collection action must be standardized, in place, and meet the criteria. As long as the collection is standardized, both methods can achieve the desired testing purpose.

What are the precautions that need to be taken when performing the test for nucleic acids?

Nucleic acid samples may not be drawn from individuals who have received the 2019 Coronavirus Disease Vaccine within 48 hours. If this is the case for you, please report this to your district.

Try not to eat for 2 hours before sampling yourself to avoid severe vomiting during sampling.

To avoid affecting the sampling results, do not drink water or beverages, smoke, drink alcohol or chew gum half an hour before sampling.

Do not clear your throat and cough up phlegm before the test and reduce swallowing.

Carry out the whole process of wearing the correct mask, remove the mask before the test, wear it immediately after the test, can be prepared as a business backup mask, convenient after the pollution can be replaced at any time.

In the process of queuing, play as little as possible on the phone, to avoid constant exposure to the uncertain air environment, it is easy to put possible viruses and other harmful items back in the pocket to take home, resulting in secondary transmission.