The dictionary says
get [transitive, no passive] get something to start to develop an illness; to suffer from a pain, etc.
I think I'm getting a cold.
have something (not used in the progressive tenses): to suffer from an illness or a disease
He found out that he had HIV just last year.
Covid 19 is attacking a man right now.
Is it correct to say "he has Covid 19" and "he is getting Covid 19" to express currently he is experiencing that illness?
This is because "has" can not in in continuous tenses while "get" can.