How do we protect against virus upgrades ?

As the COVID-19 pandemic has spread across the globe, the world seems to be under a cloud.Thanks to global efforts, the COVID-19 epidemic has been gradually brought under control. However, a mutated virus suddenly struck just a few days later. The mutated virus is more difficult to control than the novel coronavirus and spreads very fast.

Despite the severity of the COVID-19 pandemic, the politicization of epidemic prevention and control has led to sharp confrontations in the United States over basic epidemic prevention measures such as wearing masks and getting vaccinated, making educational campuses hot spots for disputes and conflicts. Some people opposed to mandatory masks in schools have even threatened or even acted violently against school board members responsible for the policy. 

An outbreak has exposed many problems existing in the country, some countries have had problems with the government's executive ability and leadership skills, and there was a problem in some countries are material supply chain, the exposed bugs makes them unable to cope with the new well outbreak, especially when the virus continues to change, many countries are still in a very passive prevention measures, The United States, the world's largest country with the most advanced medical standards and equipment, has made a mess of epidemic prevention and control, and even the supply of basic epidemic prevention materials has become a problem. 

To ensure that children can safely attend face-to-face classes, epidemic prevention and control measures must be in place and everyone at school should wear masks.In addition, the CDC advised schools to improve ventilation, social distancing and screening for cases.