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Written by: Zheng Cuibi
2021-05-15 16:20
Last update date: 2021-05-15 16:22
A 29-year-old employee of Huada Gene announced the diagnosis on the 7th of this month, which was classified as a case of unknown local origin. However, after the virus sample was submitted to the University of Hong Kong for genetic sequencing, it was found that it may not be a true confirmed case.
Pan Liewen, a professor at the School of Public Health of the University of Hong Kong, said that after analyzing the virus's genes, it was found that the patient had a "Wuhan original virus strain". The virus strain appeared in January last year, but has not been in Hong Kong or overseas for many months. Epidemic, it is believed that the patient is not infected, but his sample is contaminated, or he himself is contaminated with virus at his work place, for example, he touches his mouth and nose after being exposed to viral nucleic acid, and the test is positive.
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A 29-year-old director of a community testing center at BGI was diagnosed earlier. Pan Liewen, a professor at the School of Public Health of the University of Hong Kong, said that after analyzing his virus genes, he found that the patient had a "Wuhan original virus strain". The month has appeared, but in the past few months it has not spread in Hong Kong or overseas. It is considered that the patient may not be infected.
He estimated that perhaps because the nucleic acid of the virus contaminated the working environment of the patient, the patient’s hand touched the nucleic acid and then touched the nose. The virus stayed in the nasal cavity, so he tested positive when he was tested.
A 29-year-old man was diagnosed. He was working on the 2nd floor of Huada Gene in Tai Po Industrial Estate.
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He continued that another possibility is that the patient’s test sample is contaminated. He explained that a control sample is required for the “positive control” during testing. The original virus strain in Wuhan is generally used for comparison to confirm the test results. Credibility, so the Wuhan virus strain may contaminate other samples.
However, he believes that general sample contamination will not only contaminate one sample of the same batch, but this possibility cannot be completely ruled out.
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