Can vaccines cause chronic illnesses?

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People getting a chronic illness from a vaccine is extremely rare. All vaccines given in the United States go through rigorous testing and must be approved by the U.S. Food and Drug Administration (FDA). If studies show that vaccines are either not effective or cause other illnesses, they are either not approved or have their approval revoked.

It's also important to understand that nothing is perfect. While no confirmed studies link any currently used vaccines with serious chronic illnesses, experts cannot rule out the possibility that there may be a link for some people. But any safety measure, no matter how effective, will have a potential downside.

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Vaccines & Immunizations

Vaccines & Immunizations

Vaccines are commonly given to children in the form of a shot to help prevent serious diseases like measles and mumps. Vaccines are developed using either dead strains of a disease, weakened strains, or strains of a different dise...

ase. As adults, we receive flu vaccines or may need a booster of childhood vaccines to retain immunity. Travelers may receive vaccines either as a condition of entry to a country, or on recommendation of health officials. Generally there is little or no reaction to a vaccine, but in some cases the vaccine may cause an allergic reaction or a temporary, mild illness. Some vaccines are not safe for pregnant women, so it’s important to check with a healthcare professional.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.