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Is it a false positive case in a boy who is diagnosed with negative antibodies? Yuan Guoyong: Only when positive tracking Hong Kong can be cleared

2021-05-18T22:01:21.742Z


There were no cases of unknown origin in Hong Kong for two consecutive days. The latest case was diagnosed last Saturday (15th). The patient was a 4-year-old boy, but his samples and antibody tests were negative after admission, raising false positive concerns. Hong Kong University


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Written by: Zhu Haiqi

2021-05-17 15:25

Last update date: 2021-05-17 15:26

There were no cases of unknown origin in Hong Kong for two consecutive days. The latest case was diagnosed last Saturday (15th). The patient was a 4-year-old boy, but his samples and antibody tests were negative after admission, raising false positive concerns.

Yuan Guoyong, Chair Professor of the Department of Microbiology at the University of Hong Kong, believes that he cannot be called a false positive for the time being. "You have to work hard when the channel is positive, so that there is no (diagnosed) situation in the community, and Hong Kong has a chance to clear it."

The 4-year-old boy (No. 11822) attends Ho Man Tin Hanshi Kindergarten (Long Chief) at No. 2 Freedom Road, Ho Man Tin. May 12 was the last school day. He had fever and sore throat that night. He went to Dr. Yang Chaofat’s Clinic in Tsing Yi the next day. Seeking medical advice, the bottle was handed over to Jinyu for inspection at noon. The test result was uncertain. Later, it was confirmed to be confirmed by the laboratory of the Department of Health. The CT value was more than 30. The virus was too low to test whether it was a variant virus.

Zhang Zhujun, director of the Department of Infectious Diseases of the Center for Health Protection, revealed that his virus and antibody test results were negative after he was admitted to the hospital. It is temporarily impossible to confirm that his sample was contaminated and thus false positive, because less than 10% of people may not have antibodies.

Yuan Guoyong said that it is currently impossible to call him a false positive case. The antibodies will not appear until 7 to 14 days after the onset of the disease. He believes that "it is necessary to do enough work when the channel is positive, so that there will be no (diagnosed) cases in the community. Hong Kong "There is a chance to clear", but it will not rule out contamination in the laboratory. If there are no new cases after the multi-level tracking is completed, and the patient has no antibodies, it may be a false positive.

Lin Weixun, a specialist in infection and infectious diseases, believes that the case is "embarrassing" because the boy has obvious symptoms such as fever and should be able to produce antibodies. Those with mild or no symptoms may have too low a viral load and a low amount of replicated virus in the body. The virus only touches the human mucosa without entering the cells. It may not be able to stimulate the immune system to produce antibodies. It is also possible that the antibodies can be detected later.

The boy’s family members have not been diagnosed for the time being. Lin Weixun believes that if his family members were infected earlier than the boy’s, the current nucleic acid test may have passed the detection time. He suggested that the authorities recheck the serum for them and their school teachers and students. Once they are all negative Just suspect whether it is a false positive.

Hong Fanyi, a clinical professor in the Department of Internal Medicine at the University of Hong Kong, said that children should also develop antibodies, and I believe that the nasopharyngeal swab and stool samples must be tested to get a better understanding of the situation.

▼See the details of the scheduled vaccination and side effects of Kexing and BioNTech in the three pictures▼

In addition, Hong Kong implemented the new crown vaccination plan on the 81st. Yuan Guoyong was worried about the slow speed of vaccination in Hong Kong. He also quoted the wrong idea that Hong Kong does not need to be injected after zero diagnosis. Infection, that is, 1.5 million people were infected, of which 1% died, and 15,000 died. Many people attacked me as alarmist. New York, the United States, is the case. Both the numbers and the serum test indicate that there are two adult infections."

He also said that only more than 200 people in Hong Kong have died after being infected, and there have been heavy casualties in other areas. "There are so few deaths in Hong Kong that people are so lax and reluctant to get injections. (I hope the public) will hit the vaccine before it expires." There is no incentive for the pharmaceutical factory to re-supply to affect the supply problem.

7 days zero no source broken cable, 4-year-old boy, source unknown, 20 teachers and students quarantine of He Wentian Hanshi Kindergarten

There is no local source for two consecutive days, an additional imported case is confirmed after a 25-year-old Indonesian foreign domestic helper arrives

New Coronary Pneumonia | 4 more confirmed cases of unidentified 4-month-old boy with no source of unknown virus are recruited in the genus variant virus group

01News

New Coronary Pneumonia Yuan Guoyong

Source: hk1

All news articles on 2021-05-18

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