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Watch Crash Course Biology Season 2 Episode 39 Online

  • 1.5/10
  • COUNTRIES: United States of America
  • Subtitles: English

From the flu to COVID-19, viruses are a major threat in our everyday lives. In today’s episode of Crash Course Biology, we’ll learn why viruses are like genes in a box, and how they invade and spread between cells. We’ll also discover how vaccines and medicines help our bodies fight back.