Recently, the epidemic has shown signs of rebound. Zhang Zhujun, director of the Infectious Diseases Division of the Center for Health Protection of the Department of Health, pointed out at a press conference on the epidemic today (6th) that it has been two to three months since the peak of the epidemic, and the immunity of confirmed and recovered patients has gradually declined.
She pointed out that there were at least two cases of infection with the mutated virus strain Omicron branch BA.2.2, and another branch BA.2.12.1 after three months.
Respiratory system expert Liang Zichao agrees that Omicron has the possibility of secondary infection, and the immunity gradually weakens with time; while respiratory diseases are different from other diseases, the incubation period is short, and there is not enough time to wake up immune cells like other diseases.
However, due to the fact that the BA.2.2 virus is still circulating in the community, there is a certain degree of herd immunity, and the proportion of re-infection is not large.
▼June 3rd.
Central Lan Kwai Fong Bar Shuffle outbreak▼
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Two infections more than three months apart
Zhang Zhujun said today that there are obvious signs of a rebound in the number of epidemics recently. It has been some time since the peak of the epidemic in February and March, and the immunity of recovered patients may continue to decline over time.
She pointed out that two Omicron patients were recently diagnosed with secondary infection. According to genetic analysis, they had been infected with the fifth wave of BA.2.2, and then were infected with the new mutated virus BA 2.12.1 that appeared in May, separated by more than three moon.
Liang Zichao: It is a misconception that there will be no repeated infection
Respiratory system expert Liang Zichao explained that most people think that after infection or vaccination, there will be no reinfection, but he said: "This concept is wrong. You can't apply the principle of understanding the prevention of measles infection to respiratory diseases." He explained It means that some other diseases can be controlled by injections, and the body has enough time to wake up T cells and memory cells to resist; but the virus in the respiratory system is different, as soon as it invades the body, it is "instant", especially Omicron has a short incubation period, and the respiratory tract cannot exist forever. Immune cell protection.
▼ June 5th.
Taikoo Shing Cuihu Terrace Poyang Pavilion Enclosure Inspection▼
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Respiratory specialist Liang Zichao pointed out that patients who have been infected with Omicron have the chance to reappear twice (Photo by Lin Ruoqin)
Critic that the relaxation of measures is too hasty
However, Liang pointed out that BA.2.2 is still spreading in the community at present, and the herd immunity will be prolonged. Although a new branch of BA 2.12.1 appears, the antigenic difference between the two is small, and the community is still immune.
He continued that the epidemic has indeed shown obvious signs of rebound in recent days, because the strict social distancing measures earlier had protected some citizens from exposure to the virus. Such as bars, restaurants infected.
He believes that the relaxation of the measures is too hasty, or that strict supervision is still required after the relaxation, and the overall infection level of the society has not reached a balance to keep the epidemic running rampant.
He also pointed out that there is a significant gap between the group outbreak and the government's intervention time, which has led to the lack of data in many places.
Therefore, he said, the numbers reported by the school every day can reflect the rebound trend of the community to a certain extent, "because the school does (quick tests) every day, and Zhong Kuai analyzes the data of 10,000 people more than the University of Hong Kong."
▼ June 6th.
Kowloon Tong Fangfang Fun English Primary School Outbreak▼
An additional 543 cases have hit a new high in half a month. Those who tested positive must undergo nucleic acid review. Those who refused to submit samples or law enforcement reported 204 cases of infection in a single day. Fangfang Fun 12. Primary school students were diagnosed. 15% off ID card with two numbers, half-price admission this month, positive sewage in three districts, including Tung Chung Yingwan Park and Blue Sky Coast, the government sent 200,000 quick test kits
