Umgada ugqithiselwa ebantwini usuka kwezinye izilwanyana. Umgada ungagqithiseleka xa isilwanyana esinawo sikrwempa okanye siluma esinye isilwanyana okanye umntu. Amathe asuka kwisilwanyana esosulelekileyo angawugqithisela umgada ukuba amathe adibana nonwebu lwesinye isilwanyana okanye umntu. Inkoliso yomgada osebantwini ubangelwa kukulunywa yinja. Zingaphaya kwama-99% iimeko zomgada emazweni apho izinja ezinomgada apho izinja ezinomgada ingunobangela wokulunywa yinja. EMelika, ukulunywa ngamalulwane kungowona mthombo mkhulu wokosulelwa koluntu ngumgada, kwaye ungaphantsi kwesi-5% iimeko apho uvela khona ezinjeni. Izikrekrethi azifane zosulelwe ngumgada. Intsholongwane yomgada ihamba iye engqondweni ngokulandela iperipheral nerves. Isifo singaxilongwa kuphela emva kokuqalisa kweempawu.