At present, there are many asymptomatic new crown infections in China. In order to improve the detection rate and reduce missed diagnosis, experts will add new detection methods.
In January 20th, the novel coronavirus pneumonia epidemic prevention and control news conference in Beijing city introduced that all nasopharyngeal swabs, oropharyngeal swabs, anal swabs and sera were tested on all schools, staff, etc. For nucleic acid detection, pharyngeal swab is the most common sampling method at present. Why should anal swab be added?
In novel coronavirus pneumonia screening, Li Dongceng, deputy director of respiratory and infectious diseases division of Beijing you an hospital, introduced the nucleic acid test of the throat swab, which is convenient and quick for large-scale screening. Nasopharynx swab is more accurate than oropharynx swab, but the human body feels uncomfortable.
For some asymptomatic infection or mild infection, the disease recovers quickly after infection, and the pharyngeal nucleic acid may not be detected in 3 to 5 days. It was found that the duration of nucleic acid positive in feces or anal swabs of some infected patients was longer than that in upper respiratory tract. Therefore, increasing anal swab nucleic acid detection can improve the detection rate of infection and reduce missed diagnosis.
Li Dong once said that considering that anal swab collection is not as convenient as pharyngeal swab, at present, only pharyngeal swab and anal swab are collected for key groups such as isolation points at the same time.
Novel coronavirus pneumonia patients have longer serum antibodies, most of which can last more than half a year. When necessary, serum antibodies are also added to key groups. The purpose is to improve the detection rate and reduce the probability of false negative.