I’d recommend your friend look in a different direction, to God. God is master over everything that happens in the world. He knows where every last atom is. Evils come to warn us of our need. I pray the Lord that your friend might have this infection purged from his body, but I hope he notes there is an infection of the soul called sin which needs a cure, and its quarantine area is called this mortal coil.
The problem here at this point is the effect this last year of flooding in the area described, I think. And the hospitals serving infected persons can concentrate the infection, and become infecting "Typhoid Annies" if great care of hygeine is not uniformly maintained at these sites.
I know your thoughts are well-intentioned, but in this issue are at least probably peripheral, if not perhaps misplaced. The basic overriding issue is one of sanitation and disease control, however much guided by intents of doing good through spiritual counseling.
It's not my "friend"--it's my son. You took maybe 3 to 5 minutes to read and think over my comment before typing your response. Are you sure you thought this through thoroughly before coming up with your advice?
My experience is that my son and I have the God part of our concerns pretty well covered, and are now engaged with the more mundane prophylactic phase of the matter.