(Fighting New Coronary Pneumonia) Super-spreading experts in Hong Kong call for avoiding gathering in indoor unventilated environments
China News Service, Hong Kong, November 22 (Reporter Zeng Ping) The new crown pneumonia epidemic in Hong Kong has rebounded rapidly in recent days. In an interview with a reporter from China News Service on the 22nd, an expert said that the dancing group is a larger super-spread. Avoid gathering in an unventilated indoor environment.
According to a report from the Health Protection Center of the Department of Health of the Hong Kong Special Administrative Region Government, as of 0:00 on the 22nd, the cumulative number of confirmed dance groups has increased to 80. The Hong Kong Special Administrative Region government issued a mandatory test announcement for the first time, requiring people who have visited 14 dance venues in Hong Kong within the prescribed time limit to be tested for the new crown virus before November 24.
Since the emergence of the epidemic, many public places in Hong Kong have undergone long-term strict disinfection. Cleaners in subway stations use disinfection wipes to clean the elevators and the handrails in the carriages. Many elevator buttons in residential buildings and office buildings are equipped with plastic covers. The World Health Organization has earlier admitted that indoor aerosol transmission may cause outbreaks in poorly ventilated indoor places. Before the epidemic rebounded significantly, Hong Kong gradually relaxed restrictions on indoor gatherings. Does this confirm that Hong Kong, where all the people can wear masks, is making slow progress in dealing with the risk of indoor aerosol transmission?
Hong Kong respiratory specialist Liang Zichao believes that poor indoor air flow in Hong Kong buildings is a long-standing problem. Simulation experiments show that the cultivated new coronavirus with limited sensitivity can exist in aerosols for more than 4 hours. There is reason to believe that the risk of airborne transmission of the new coronavirus is higher than that of influenza virus. This time, the large-scale super-spreading dance group may have various factors such as droplet transmission and environmental pollution. Whether there is air transmission is yet to be determined after detailed investigation.
Jin Dongyan, a virologist and professor in the Department of Biochemistry of the Faculty of Medicine of the University of Hong Kong, believes that the statement has some truth. The cleaning and disinfection of the surface of all objects is auxiliary in nature. Doing so can solve everyone’s concerns, and its actual effect is not critical. Because the new crown virus is mainly spread through person-to-person contact, it is very likely that a super spreader appeared in the dancing group to spread the virus, and the non-confirmed people were infected by contact with a certain object with the virus.
Jin Dongyan pointed out that there may be live new coronaviruses on the surface of objects, but how much of it can cause infection remains to be studied. He also mentioned that aerosol transmission can occur in confined spaces under certain conditions, and the lack of air circulation can cause particles to almost become airborne. Therefore, maintaining ventilation is more important than doing a good job in disinfection and cleaning.
Regarding how Hong Kong responds to the new wave of epidemics, Liang Zichao said that the next two weeks will be the prime time for intervention to control the epidemic. The SAR government should take a multi-pronged approach from tightening social distancing measures and increasing the number of virus tests, and strive to minimize the chance of super-spreading infiltrating the community in a short time. When Hong Kong citizens enter the indoor environment, in addition to wearing masks and paying attention to hand hygiene, they must also pay attention to whether the air is circulating. If there is no circulation, try to avoid gatherings.
Tang Jisheng, vice president of the Hong Kong Medical Council Licensed Doctors Association, believes that the fourth wave of the epidemic in Hong Kong is the result of the joint efforts of the citizens. In the future, the most important targeted measures will continue to ensure that all Hong Kong citizens maintain a high degree of awareness of epidemic prevention and strict compliance. Epidemic prevention measures. He pointed out that there is no way to completely prevent infection of people with low awareness of epidemic prevention. The SAR government and citizens are now in the same boat, and they need to work together to face the battle against the epidemic that has already begun. (Finish)