ACIP recommends that people working in healthcare settings be vaccinated against influenza, hepatitis B, measles, mumps, rubella, varicella, and pertussis. For measles, mumps, rubella, and varicella, serologic evidence of immunity is an acceptable substitute for documentation of vaccination. In addition, microbiologists working in a laboratory should receive meningococcal conjugate and meningococcal serogroup B vaccines. In rare cases, some laboratory personnel should also receive polio and typhoid vaccines. For more information, see www.cdc.gov/mmwr/pdf/rr/rr6007.pdf.