Majority of coronavirus cases at Massachusetts public events were vaccinated, study shows
- The study, published by the US Centres for Disease Control and Prevention, showed that three-quarters of those infected were fully vaccinated
- The new study’s authors recommended that local health authorities consider requiring masks in indoor public settings regardless of vaccination status
A new study by the US Centres for Disease Control and Prevention showed that three-quarters of individuals who became infected with Covid-19 at public events in a Massachusetts county had been fully vaccinated.
The study, published on Friday, showed that three-quarters of those infected were fully vaccinated, suggesting the Delta variant of the virus is highly contagious.
A separate CDC internal document, first reported by The Washington Post on Friday, described the Delta variant as being as transmissible as chickenpox and cautioned it could cause severe disease.
The new study’s authors recommended that local health authorities consider requiring masks in indoor public settings regardless of vaccination status or the number of coronavirus cases in the community.
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The study identified 469 people with Covid-19, 74 per cent of whom were fully vaccinated, following large public events in the state’s Barnstable County. Testing identified the Delta variant in 90 per cent of virus specimens from 133 people.