A tetanus booster is required every 10 years to maintain immunity. In addition, any adult who comes in contact with babies (i.e. parents, caregivers) should be immunized against pertussis (whooping cough), a very common cough that can be very dangerous if caught by a baby who has not yet completed the series.
Often these 2 immunizations are given together as part of the DTaP/ DTP shot (which also includes immunization against diphtheria).
Pregnant women, the elderly, and others in certain high risk categories should receive a yearly flu shot in the beginning of the fall