Two recent publications conclude there are no differences between surgical masks and respirators for preventing person-to-person transmission of infectious respiratory viruses like SARS-CoV-2 and influenza. But these studies are deeply flawed.
These precautions include wearing a high quality mask and social distancing when it’s not possible to avoid crowded indoor spaces, according to the CDC.
Long story short, you are likely contagious for about 10 days after symptoms begin. You should isolate for the first five days and wear a mask on at least days six through 10.