No definitive studies exist that prove masks prevent infections.
Check me out on that one.
Also, masks are designed for different purposes, and only a select few guard against infectious diseases. Picking the right type of mask, using it correctly and then disposing of it properly is the key to making masks work.
The national Centers for Disease Control and Prevention (CDC) and the Mississippi State Department of Health (MSDH) continue to closely monitor an outbreak of respiratory illnesses caused by coronavirus (COVID-19) that was first detected in Wuhan, China.