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Why herd immunity is elusive; tips for new hikers; what testing positive for HIV means: Upstate Medical University's HealthLink on Air for Sunday, June 20, 2021

WRVO logoStephen Thomas, MD, explains the concept of herd immunity and how society may not achieve it for COVID-19. Carol Sames, PhD, talks about why and how to get started hiking. And Elizabeth Asiago Reddy, MD, describes what happens after a person tests positive for HIV, the virus that causes AIDS.


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