There were more than 1, new cases of COVID-19 in Japan for three consecutive days. Why did the epidemic rebound again?

According to the global epidemic data released by the World Health Organization, the epidemic situation in many countries in the world is rebounding, and Japan has added more than 1, cases of COVID-19 for three consecutive days. The Japanese Institute of Infectious Diseases found through research that the latest Covid-19 is a mutated virus with a new gene sequence. This new virus may be more infectious and aggressive, so we should be more careful to guard against it. Second, short-distance travel promotion activities in Japan

Perhaps because the epidemic situation has shown a relatively good trend before, with the opening of restaurants, the return of workers and the resumption of school, the people have relaxed their vigilance. In order to restore the domestic economy as soon as possible, the government has launched a series of preferential travel promotion activities, giving Covid-19 an opportunity to take advantage of it, which has intensified the spread of the epidemic. Earlier, there were many reports that family members were infected with each other because of going out for a party and dinner, or even just going to the bathroom or taking the same vehicle in the same place, and a patient infected with Covid-19 was infected with many strangers. Therefore, it is necessary to reduce going out and do personal protection. Third, Japan's lack of efforts in Covid-19 testing

Japan's laws on infectious diseases stipulate that patients can be required to be hospitalized, but there is no law expressly stipulating that relevant departments can force ordinary people to carry out testing, which may lead to the spread of the virus among healthy people without nucleic acid testing in people who have been infected with Covid-19. Nucleic acid detection is one of the better methods to detect Covid-19 so far, which can find the potential source of infection as much as possible, and once asymptomatic infected people are found, they can also be isolated and treated immediately, so as to grasp the key point of prevention and control. For example, a nationwide nucleic acid test was conducted in Wuhan, China, which provided a good basis for government prevention and control, workers' return to work and school resumption.