Phase III trials usually involve more participants, including a control group, and test the effectiveness of the vaccine in preventing disease, while monitoring for adverse effects at the optimal dose.
Kwa kawaida majaribio ya awamu ya III yanahusisha washiriki zaidi, ikiwemo kikundi cha kudhbiti, na kupima ufanisi wa chanjo ya kuzuia ugonjwa huo, wakati ikifuatilia athari mbaya kwa kipimo bora kabisa.