Help the HIV kid out
Teach the hiv
(+) classmate how to sneeze into his arm rather than "on every one" or on anyone one.
I hope by the question, you were inferring that the HIV (+) class mate was purposely sneezing on everyone; even so, contracting HIV this way is not a feature of this disease i would worry about.- would however, observe good hand hygiene (i.e. Wash your hands!).