Which statement regarding the adverse effects of immunization is true?

The statement that swelling of glands in the cheeks and neck is an adverse effect of the measles vaccine is accurate. The measles vaccine can lead to several common side effects, including mild fever and rash. In some cases, individuals may experience swelling of the glands, particularly in the neck area, which is linked to the body's immune response as it builds protection against the measles virus. This response is typically mild and self-limiting.

Understanding this aspect of vaccine side effects is crucial when discussing immunization with patients or caregivers, as reassurance about the mild nature of these reactions can promote vaccine acceptance and adherence to immunization schedules.

The other statements contain inaccuracies related to vaccine safety or adverse effects. For example, while acute encephalopathy can occur with certain vaccines, it is not exclusive to diphtheria vaccines. The assertion that the Hepatitis B vaccine is the safest because it causes no adverse side effects is misleading; while it is generally safe and well-tolerated, like all vaccines, it can have mild side effects, such as soreness at the injection site or low-grade fever. Lastly, the oral poliovirus vaccine is actually associated with a very small risk of causing vaccine-derived paralytic poliomyelitis, which contradicts the