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htmlOn January 26, a positive case was found in the train departing from Guangzhou - the incoming person, Yu, took the train to Wuhu, Anhui after the 14-day centralized isolation period in Guangzhou. After getting off the train, he tested positive for at the isolation point. The news ofhas aroused great concern among the people along the way. Some netizens have suggested that many cases were found to be positive after 14 days of isolation. "Why not quarantine for a longer time?"
Indeed, it is not an isolated case that the nucleic acid test was found to be positive after the incoming personnel were released from isolation. Southern+ reporters sorted out official reports and found that there were at least 10 such cases. Why do nucleic acid tests still occur after
14 days of centralized isolation? Has the incubation period of the new coronavirus been extended? Is it necessary to extend the centralized quarantine time? Why is
isolated for 14 days?
V incubation period does not exceed 14 days
At present, my country stipulates the centralized isolation and observation time for incoming personnel and high-risk areas to be 14 days. Why is this regulation?
In fact, the isolation period for all infectious diseases is determined based on the incubation period.
In the early stages of fighting against the new coronavirus, people refer to the laws of other respiratory infectious diseases to judge that the incubation period of the new coronavirus is within 14 days. In the more than a year of fighting the epidemic, facts have also proved that the vast majority of patients have not been more than 14 days from infection to onset.
In February 2020, Zhong Nanshan, an academician of the Chinese Academy of Engineering, published a research paper "Clinical Characteristics of China's 2019 Novel Coronavirus Disease" in the "New England Journal of Medicine", pointed out that the median incubation period of the new coronavirus is 4 days. Is the virus in latency contagious? The answer is yes. In November 2020, a new study released by the University of St Andrews in the Lancet found that patients with new coronavirus pneumonia are the most contagious two days before the symptoms and five days after the infection.
Therefore, even asymptomatic infections are currently in isolation, observation and management according to confirmed cases.
has the incubation period been extended?
is an individual phenomenon of more than 14 days
Although the incubation period of most infection cases does not exceed 14 days, the situation of the new coronavirus lurking in the infected person for a long time is also reported from time to time. , director of the Department of Infection, Guangzhou Eighth People's Hospital, Cai Weiping, said that if is infected with the new coronavirus, most people can detect viral nucleic acid in the upper respiratory tract within 14 days, but this is not 100%.
In February 2020, some provinces in China reported cases of ultra-long incubation period, such as a case of asymptomatic COVID-19 in Enshi Prefecture, Hubei Province; a case of asymptomatic COVID-19 in Fujian Putian City in Fujian was confirmed to be a case of asymptomatic incubation period of 29 days.
However, compared with the huge total number of infections, it is still rare to have a latency period exceeding 14 days. On January 13, Wang Guiqiang, director of the Department of Infectious Diseases of , Peking University First Hospital, pointed out at the press conference of the State Council’s Joint Prevention and Control Mechanism that it is an individual phenomenon that the virus is still found after 14 days of isolation.
" The incubation period of the new coronavirus is basically within 14 days, most of which are within 3-7 days, and some of them exceed 14 days also exist, and there are also previous cases. Whether the incubation period has been extended, further analysis is needed. " he said.
Virus positive
After the ultra-long incubation period, is it contagious?
After the quarantine of incoming people was lifted, the nucleic acid test was positive. Is it contagious? The answer is yes. Cai Weiping said that the intensity of infectivity is related to the viral load and transmission method, and has nothing to do with the time when the nucleic acid is detected to be positive.
On November 26, 2020, an Indonesian man entered China and was released from quarantine after 14 days in Fujian. The nucleic acid test was negative.
On December 10, the man arrived in Shunyi, Beijing. On December 26, his nucleic acid test result was still negative, but he was found to be positive two days later.
This man is the source of the local cluster epidemic in , , Shunyi District, Beijing. As of January 10, 2021, a total of 25 local confirmed cases have been reported in Shunyi District.
Will the quarantine period be extended?
Experts believe that it is not necessary for
virus to appear "extra-long standby". Is it necessary to extend the centralized quarantine period in entry?
Professor of the Institute of Virology, Wuhan University, , School of Medicine, , Yang Zhanqiu, , In an interview with the media, judging from the recent epidemic situations in various places, the epidemic characteristics and incubation period of the new coronavirus have not exceeded the current cognitive scope. The existing epidemic prevention measures of are still effective, so there is no need to extend the centralized isolation period .
Cai Weiping also disagrees with extending the centralized quarantine time in entry: "The longer the quarantine time, the safer it is, but the cost-effectiveness is getting lower and lower." He said that extending the quarantine period will inevitably increase the cost of social operation and is also a harm to the subjects of isolation observation.
"What's more, even if it is extended, it cannot be guaranteed 100% that the nucleic acid positive will not be detected only after the quarantine is released. Everyone is still worried." Cai Weiping believes that after the quarantine is released, it is enough to continue monitoring. How to deal with the virus "ultra-long lurking"?
Attached home isolation and monitoring measures in many places across the country
virus "super long standby" How to deal with it?
At present, many places across the country are strengthening entry isolation measures, and in addition to centralized isolation policies, flexible attachment of home isolation and home health monitoring policies.
Guangdong strictly implements the policy of "14+7" , and implements 7 days of home health management for overseas incoming personnel after 14 days of centralized medical observation and negative nucleic acid test. Guangdong also advocates gatherings such as rural weddings and white events, and does not invite people who have just been released from quarantine after entering the country to participate.
Zhejiang stipulates that "14+7+7" health management measures should be implemented for incoming personnel. Entryers must first undergo centralized isolation in hotels for 14 days, and then undergo 7 days of home isolation. After obtaining the "green health code", they must cooperate with the community to complete the last 7 days of health monitoring.
Beijing Shunyi District implements the "14+7+7" health management measures for people entering Beijing from abroad, that is, after the 14-day centralized quarantine period expires, people entering Beijing will continue to carry out 7-day home or centralized quarantine, and will undergo 7-day health monitoring after the expiration of the period. People entering Beijing at other ports in China can only enter Beijing for 21 days, and then undergo 7 days of health monitoring after entering Beijing.
It should be noted that home isolation and home health monitoring are not the same concept. Home isolation requires strict protection, and live alone under the guidance of community medical staff and cannot go out.
Home health monitoring means that necessary work and life travel can be carried out on the premise of taking the initiative to take personal protection, but daily monitoring of body temperature, symptoms, etc.
[Reporter] Huang Jinhui Li Xiuting Intern Li Jianxin
