Health officials in the United States will on Friday explain the science behind their U-turn on face masks, as Republicans express skepticism over the decision – which appears to have stemmed from research into a July 4 outbreak.

The Centers for Disease Control and Prevention (CDC) on Tuesday announced that they were updating their previous guidance to now recommend that vaccinated people wear face masks once more, when indoors and in parts of the country with substantial COVID-19 transmission.

They did not explain their reason for the shift in policy – which has sparked fevered debate – and merely said it was due to new data on the highly contagious Delta variant. On May 13 the American public was told they no longer needed to wear masks indoors if vaccinated.

An internal federal health document obtained by The Washington Post explained the new data, and reported that the Delta variant was as infectious as chickenpox or Ebola – with each infected person passing the virus to eight or nine others, on average. That infectivity is known as R0.

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