Even if they have been previously vaccinated, individuals who reach the age of 50 should be revaccinated with which of the following vaccines?

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Vaccination against tetanus, a potentially deadly illness, loses its efficacy over time. All individuals, even those who have been previously vaccinated against the disease, should be revaccinated at age 50. Pneumococcal vaccines should be given to all individuals at age 65, and to younger individuals with certain immunological deficits (e.g., asplenia). Measles and mumps are childhood diseases. After a child completes his or her initial vaccination series against these illnesses, he or she is protected for life.

Even If They Have Been Previously Vaccinated, Individuals Who Reach