Two new studies provide insight into the strength and length of natural immunity to COVID-19. As emerging variants rapidly increase the spread of COVID-19 in many countries, such as the UK and Brazil, the proportion of past infections in different populations is becoming significant. These increasing pools of previously infected people may even be enough to assist vaccination programs in reaching the threshold of immunized citizens required to achieve herd immunity – a potential silver lining of the failure to prevent the rampant spread of novel variants in some countries. However, before these groups can be factored into our estimations of reaching herd immunity and easing the impact on healthcare systems, two...
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