U.S. President Donald Trump said at a White House press conference that the U.S. Centers for Disease Control and Prevention recommends that people wear “cloth masks” to prevent new coronavirus infections. This is a new change in the attitude of U.S. officials on wearing masks. The CDC said in a new statement that the recommendation to wear a mask was prompted by recent research that found that a large proportion of people infected with the new coronavirus were asymptomatic, and that some had transmitted the virus to others before symptoms appeared.
In view of this, the CDC recommends that Americans wear cloth masks in crowded public places such as supermarkets and pharmacies to curb the spread of the virus community.
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As the United States continues to face shortages of masks, ventilators, protective clothing and other materials, the CDC recommends that people wear ordinary cloth masks, can use cotton cloth homemade, low-cost, and stressed that N95 masks and medical surgical masks and other care and first responders.
U.S. officials and the medical community have been advising people to wear masks, and there have been attacks on subway cars that have been attacked for wearing masks and being treated as carriers of the virus. The new U.S. recommendations on wearing masks are not only due to the rapid escalation of the outbreak, which has prompted the renewal of U.S. prevention and control measures, but also to highlight the fact that asymptomatic transmission complicates the U.S. outbreak prevention and control situation.
As of May, there were more than 330,000 confirmed cases in the United States, the highest number of confirmed cases in the world, according to the latest statistics released by Johns Hopkins University.
Robert Redfield, director of the U.S. Centers for Disease Control and Prevention, said recently that up to 25 percent of new u.S. crown-confirmed cases shownoieutic symptoms, which is an important reason why the epidemic is spreading so fast across the country, which also poses a major challenge to predicting the development of the outbreak and preventing it.
Experts say the potential risks posed by asymptomatic infections should be of high concern. On the one hand, we should continue to expand the scope of virus detection, on the other hand, to strengthen prevention and control measures, including wearing masks, expand social distance and so on.
Stanley Perlman, a professor of microbiology and immunology at the University of Iowa in the United States, told Xinhua that asymptomatic infections make prevention and control difficult. At this stage, it is not clear how much asymptomatic infections will spread the virus.
In general, the virus is generally not contagious during the incubation period, because the incubation period is the time when the virus replicates in the human body, and when it reaches the stage of producing symptoms, it is contagious, Zhang Qi, associate dean of the University of California, Los Angeles School of Public Health and professor of epidemiology, told Xinhua. However, it is also possible that asymptomatic infections are contagious.
Zhang said that in order to prevent and control the spread of new coronavirus in asymptomatic infected people, it is necessary to isolate asymptomatic infected persons and close contacts for 14 days.
Xinhua News Agency reporter Tan Jingjing