has role immunizes against pathogen organism vaccine combination vaccine role combination vaccine 2 https://github.com/vaccineontology/VO/issues/621 MeSH: D017778 combo vaccine Combination vaccine is a vaccine that induces protection against multiple infectious diseases or several different serotypes of the same organism. The anitgens contained in combination vaccines are either formulated together by the manufacturer or physically mixed by a health care provider just prior to administration. Both approaches require licensure. Ref: Baylor NW and Midthum K. Regulation and testing of vaccines. In: Vaccines (Editors: Plotkin S, Orenstein W, and Offit P). 2008. p1624. Oliver He vaccine