First Officer reported flying with two different Captains who exhibited symptoms from COVID-19.

Narrative

I operated Aircraft X with Captain X. The next day I received a text message saying that his sore throat on that leg became aches and chills and his COVID test was positive. I worked three days with Captain (CA) Y. On the first leg; he was audibly sniffling. I asked if he felt OK; he said it was allergies due to a soapy smell in the flight deck. The next leg; new airplane; constant sniffling with a very intermittent cough. I was told he had dry pipes; and it was just his allergies. I put my mask on for the remainder of the flight. And informed CA Y; he sounded terrible. The next day the running nose continued. CA Y; was seated behind me on DH; audible sniffling was so constant I relocated my seat. He text the next day saying he was so exhausted he slept twelve hours. I stated we can add fatigue to your COVID symptoms. On the van he verbally told me he woke up incredibly sweaty.My work health; and safety was negatively affected by CA X and Captain Y; lacking the personal responsibility of following company guidelines for reporting to work. Those expectations are laid out in pilot bulletin for revised coronavirus guidance.Pilot bulletin also sets an expectation of contacting medlink; the symptomatic pilot donning an N95; and containing himself to the flight deck.