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On January 18, Beijing added an asymptomatic infection to a 9-year-old boy. The boy subsequently developed a fever and other symptoms and was diagnosed as a confirmed case. On January 20, a press conference on the prevention and control of the new corona pneumonia epidemic in Beijing revealed that all students, teachers and staff at the school where the case was located had been screened for nasopharyngeal swabs, oropharyngeal swabs, anal swabs and serum. . For nucleic acid tests, the most common sampling method is throat swabs. Why should anal swabs be added?
“Daily Economic News” quoted Li Tong, deputy chief physician of the Department of Infectious and Respiratory Diseases at Beijing You’an Hospital, as explaining that when a new coronary pneumonia screening is performed on people related to the epidemic , Oropharyngeal swab nucleic acid testing is primarily used because it is convenient and fast Suitable for large-scale screening. The accuracy of nasopharyngeal swabs for detecting COVID-19 is higher than that of oropharyngeal swabs, but the human body feels less comfortable.
For some asymptomatic or mildly infected people, the condition recovers quickly after infection, and pharyngeal nucleic acid may not be detected within 3 to 5 days. Studies have found that the duration of nucleic acid positive stools or anal smears from some infected people is longer than the duration of the upper respiratory tract. Therefore, increasing the detection of nucleic acid from anal smears can increase the detection rate of infected persons and reduce the missed diagnosis.
Li Tong once said that, considering that collecting anal swabs is not as convenient as throat swabs, currently only throat and anal swabs are collected from key groups such as isolation points. Serum antibodies from people infected with new coronary pneumonia last longer, most of which can last for more than half a year, and serum antibodies will be added to key populations if necessary. The purpose of this is to increase the detection rate and reduce the probability of false negatives.
Furthermore, according to official Weibo news from Tianjin Municipal Government Information Office, Tianjin Prevention and Control Headquarters stated that on January 21, 17 samples for nucleic acid testing of serum powder imported from Ukraine were found. by a food company in Binhai New. Area, Tianjin. The test result was positive.
On January 20, the Binhai New Area Center for Disease Control and Prevention conducted a sample collection of a batch of imported serum powder raw materials from Ukraine used by the company. A total of 20 samples of whey powder raw materials, 20 samples of outer packaging coatings and chocolate made with whey powder were collected. 19 samples of the finished product and outer packaging were smeared. After testing, the results of the Nucleic acid test of 17 raw serum powder samples were positive and the other results were negative. On January 21, after the review of the Municipal Center for Disease Control and Prevention, the result remained positive. Related products did not flow to the Tianjin market.
At 5:00 p.m. on January 22, the inventory of goods related to the epidemic was sealed, the outgoing goods were monitored and the relevant information was notified to other provinces and cities; food, packaging and the external environment of the epidemic. The related assets have been fully covered again. Sampling, analysis and disinfection, a total of 204 samples were collected and the results of the nucleic acid tests were all negative. Three people at risk of exposure and another 31 employees of the company were quarantined and sampled. The results of the nucleic acid tests were all negative.
(During the middle)
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