What's the causes of strep throat besides being exposed to it?

Intake of germ: Exposure occurs daily in most populated settings since as many as 20% can carry the germ without symptoms in some seasons.To develop symptomatic disease, you must first be susceptable (a complex individual issue). You must also encounter a transfer event,where the germ moves from the source to your mouth.Through a kiss,off contaminated fingers, etc.it moves in & lives in your mucous & you get sick