Which vaccination is suggested for adults without immunization records according to the CMAJ guidelines?

The recommendation for the measles/mumps/rubella (MMR) vaccine for adults without immunization records is based on the significant public health implications of these diseases, particularly in populations that may be at higher risk for exposure or transmission. MMR vaccination is crucial because measles, in particular, is highly contagious, and outbreaks can occur rapidly in communities where vaccination rates fall below herd immunity thresholds.

Adults who lack immunization records should receive the MMR vaccine, as they may have missed childhood vaccinations due to various reasons such as changes in healthcare access, lack of awareness, or public health shifts. The MMR vaccine not only protects the individual but also contributes to the broader community's immunity, which is essential for preventing outbreaks.

While other vaccinations, such as COVID-19, influenza, and hepatitis A, are also important, the MMR vaccine is emphasized in the context of addressing gaps in immunization that can lead to resurgence in these diseases. This approach aligns with public health strategies aimed at reducing the incidence of vaccine-preventable diseases and protecting vulnerable populations.