True or false: A mild illness is not a contraindication to vaccination.

• A. True.
• B. False.
• C. Not necessarily.
• D. Only with certain vaccines.

Answer: (A)

A mild illness does not prevent vaccination because it does not increase the risk of a vaccine reaction or interference with the immune response. The body's ability to mount a protective response to the vaccine remains intact during a minor, uncomplicated illness, so giving the vaccine now helps prevent disease without adding meaningful risk. Delaying vaccines is generally reserved for more significant illness—moderate to severe fever, dehydration, or a serious acute condition—when vaccination should wait until recovery or a clinician’s assessment. In everyday practice, mild illnesses such as a slight cold or low-grade fever are not contraindications, so the statement is true. If a child has a moderate or severe illness, or a history of severe allergic reaction to a vaccine component, vaccination would typically be postponed.