As of November 3, 2021, there have been nearly 250 million cases of COVID-19 around the world with more than 5 million deaths. In Vietnam, this number is 932,357 cases, including 22,205 deaths. The epidemic continues to be complicated, with a high risk of infection in small, crowded spaces such as elevators. It is really necessary to equip bactericidal measures to prevent the risk of infection in
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