Is "infectee" commonly used when saying the patients of confirmed cases? Or is there any other ways I can call them?
No, "infectee" is not a word and so it is not common to use in that case. There are different phrases you can use depending on what the person is infected with. In this case, if you are referring to someone infected with coronavirus, you can refer to them as "people who tested positive for COVID-19" or simply just "infected people" or "COVID-19 positive people". Ex: People testing positive for COVID-19 must be quarantined.
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