INTERPRETIVE SUMMARIES, OCTOBER 2021 Journal of Dairy Science - ven, 01/10/2021 - 00:00 Invited review: A critical appraisal of mastitis vaccines for dairy cows. By Rainard et al., page 10427. Mastitis is a major nuisance in dairy farming. Prevention through hygiene practices is laborious and would benefit from being supplemented by vaccination. Effective vaccines are wanted. This review draws up an inventory of past and present vaccines against the major pathogens of the mammary gland and reveals the reasons for their limited efficacy. This information should help in the design of new avenues of research for their improvement.