The flu can also cause a general feeling of fatigue or malaise, Ray says, as well as gastrointestinal issues like diarrhea and nausea, especially among children. As with COVID-19, some people also ...
It is contagious in humans and is the cause of the coronavirus disease 2019 (COVID-19). Non-active site mutations such as L50F are crucial for restoring the viral fitness of SARS-CoV-2 main protease.