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Dr. Peter Hotez: Researchers have been planning for virus variants

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Dr. Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine, joins Lawrence O’Donnell to discuss the new South African variant of Covid-19. Dr. Hotez says because the durability of the current vaccines are still unknown, “everyone was pretty confident” an additional immunization would be needed, something researchers are already developing.