Dr. Li take Covid 19 precautions carefully, he was a physician, MD of Fushun infectious disease hospital for two years(1982-1984), so he has more clinical experience and knowledge about bacteria, virus, treatment and prevention for infectious diseases. He dose many prevention in his office now: double disposable full paper sheets, disposable needles, N95 mask, disposable gloves, separately treat patients; two UV lights used to kill viruses and others in the air and surface everyday; sanitizer ; alcohol . His office doesn't has Covid positive people since covid19 started.