F1 COVID-19 8 times tested negative, only positive for 9 times, why?

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After testing twice with negative results, patient 1,342 was quarantined at the inn. On November 28, patient 1,342 was sampled for the third time, with positive results.
On the afternoon of November 30, after receiving information about a positive case from the isolated patient, patient number 1,347, directly related to patient 1,342, the functional forces temporarily blocked, cleaned and disinfected. , taking samples for testing for more than 20 households in 2 alleys 106 Binh Tien and 97 Pham Phu Thu, Ward 3, District 6, HCMC. At the same time, the alley area is also blocked, with barriers to limit travel and contact.
The "super-infectious" passenger car runs "undercover" for 4 trips from Hai Phong to Ho Chi Minh City, spreading serious diseases youtuber09:46:59 29/06/2021This is a "super-contagious" bus, causing many cases of COVID-19 in Hai Phong and a number of provinces and cities across the country. Regarding the North - South bus route, despite the epidemic prevention regulations, it still operates illegally, causing the spread of serious...
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