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Mayo Clinic specialists answer health questions.

  1. COVID-19 infections by race: What's behind the health disparities?

  2. Measles vaccine: Can I get the measles if I've already been vaccinated?

  3. Colloidal silver supplements: Are they safe?

  4. Food poisoning: How long can you safely keep leftovers?

  5. Candida cleanse diet: What does it treat?