Natural Immunity vs Vaccinated Immunity with the Delta Variant

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How is natural immunity vs vaccinated immunity doing against the Delta variant?

How well does natural immunity work against Delta compared to the original strain?

How well do different vaccines work against the Delta variant?

We know more now about the Delta strain of Covid-19. In this video I review three studies comparing natural immunity and vaccinated immunity with Coronavac against the Delta variant. One of the studies also compares other variants to the Delta variant.