Valtrex is the standard go to antiviral
that Montoya and open medicine institute use for all these viruses discussed. They may use famvir but hard to get covered for insurance. So yes, valtrex would be used for any cfs virus at this point.
Of course if your talking infections in general than that is an immensely broad term. Infections could be bacterial in nature and then, obviously you would take the recommended medication.
My list above is for viruses such as cmv, hhv6, ebv, etc.