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Ask your mother to get isolated in one room sir.. Yu can stay in a different room . Have both your rooms as ventilated as possible.. Wear double mask when u go to serve her food or anysort of contact. Wash your hands with soap and water before you eat. Maintain social distancing sir. If yu want tablets you can take zinc and vitamin c tablets sir.

Isolation and distancing necessary to maintain you should try to isolate different place and care her visiting with protection

Use mask all the time. Use gloves while giving medicine, food to your mother or everytime you come in direct contact with her As such there's no prophylactic medication for covid. Still you can start vit C, zinc after consulting nearby physician or teleconsultation.