Why is it recommended to only get the tdap vaccine once in your lifetime, if it only protects against pertussis for a few years?

Need boosters: Tdap is vaccination for three diseases, tetanus, diphtheria and pertussis and you do need booster doses at different times. You may consult this site for more information, http://www.webmd.com/vaccines/tdap-vaccine-for-adults#1 You City health department may be able to provide more information. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.

Explanation : All adults already immunized in early childhood and teenager age to DtaP and TdaP. P is for pertussis. Usually average time of immunity after vaccination just around 10 years. TdaP now recommended for pregnant women for prevention newborn babies ,who is very vulnerable. And boost mother,s immunity to diphtheria. In some country that is important as well.

Grandparents, too!: If grandparents are to be around infants under 6 months of age (when the DTaP is first given), those grandparents need to get a TDaP (Boostrix) to insure they do not inadvertently spread pertussis to the infant. Saddle up, Grandma & Grandad and protect your grandchild. (Consult the ACIP of the CDC&P website).