Following a rubella outbreak, which documentation is considered acceptable evidence of rubella immunity for employees?

• A. Written documentation of rubella vaccination after the first birthday
• B. Serologic rubella IgM positivity
• C. History of rubella infection alone
• D. Two rubella vaccines given before age 1

Answer: (A)

Immunity evidence for rubella in employees comes from proof of protection, typically shown by documentation of receiving a rubella-containing vaccine after the first birthday. A record of vaccination after 12 months confirms that the person has been appropriately immunized, which is why this option is the best evidence of immunity. Rubella IgM positivity signals a current infection, not immunity, so it wouldn’t be used to demonstrate protection. Relying on a history of rubella infection alone isn’t as reliable, since infections can be undocumented or misremembered, and serologic proof of immunity (like IgG) is preferred when available. Two vaccines before age 1 don’t reflect the standard timing for rubella immunization and don’t by themselves confirm immunity for workplace protection.