I have a silly question regarding having COVID and patient care

[RUNNER87RCC, EMT-B]

Symptoms started Monday night. Antigen tested negative Wednesday. PCR Friday positive. Antigen positive today.  Only symptoms has is congestion, post nasal drip, neck pain, clogged ears, and a wet cough. At the 5 day mark. Had COVID once but way was scheduled didn't go back for 9 to 10 days was negative with the antigen then. This is the first time back to work positive with COVID. Outside of hand hygiene and wearing a mask how do you not get your patient's sick??