Vaccines, skepticism, and herd immunity

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A woman holds a small bottle labeled with a "Vaccine COVID-19" sticker and a medical syringe in this illustration taken April 10, 2020. Photo credit: Dado Ruvic

Some companies are in phase three trials for COVID-19 vaccines. KCRW looks at the work being done by Moderna, Pfizer, and AstraZeneca. However, some Americans are concerned about safety and effectiveness. How many people will have to get vaccinated to achieve herd immunity?