Can you get measles if vaccinated? Learn the real breakthrough risks, why it happens, symptom differences, and how vaccine protection reduces severity. Essential measles immunity facts.

Learn how long the shingles vaccine lasts with data on Shingrix protection (7+ years), comparison to Zostavax, factors affecting longevity, and CDC recommendations for adults over 50.

Learn why flu reinfection happens, who's most vulnerable, and how to prevent getting influenza twice. Expert tips on vaccines, immunity duration, and protective habits.