BBTác giả: Rabie, Nagwa S.; Người hướng dẫn: -; Người tham gia: Girh, Zeinab M. S. Amin (2020)
The types of vaccines include attenuated live vaccines, and these vaccines were shown to be effective in inducing protection. The second type is killed vaccine or whole bacteria extracts which is less successful in providing protection compared to live vaccines. The metabolic product vaccine (toxoids) is the third type of vaccine. The recombinant DNA technique was adopted to produce the protective antigens in a sufficient amount and in cost-effective ways. 
