Some people will need two shots. Diphtheria is a very serious disease. About one in every 10 people who get diphtheria die from it. If you are not protected, you should get the varicella vaccine. It takes two shots to get full protection.
Protection is important because chickenpox is a very serious illness in adults.
Everyone age 65 or older needs one shot of pneumococcal vaccine. Everyone who is 65 or older should get a flu shot every year in the fall. The flu virus changes from year to year, and the vaccine changes to match the new virus. Adults of any age who want to be protected against the flu should get a yearly flu shot. You cannot catch flu or pneumonia from the shots.