Covid, indoor masks also for the vaccinated? The US thinks about it – Foreign

Washington, July 27, 2021 – Turnaround in United States onmandatory mask to fight the Covid. The Centers for Disease Control and Prevention is preparing to recommenduse of masks indoors also for the vaccinated, at least in some circumstances, the New York Times reports citing reliable sources. Just two months ago the recommendations were the exact opposite. The decision is based on the spread of Delta variant, capable of infecting a greater number of vaccinated than initially expected.

The bulletin in Italy of 27 July

Coronavirus: infections in the world

The study: underestimated infections in the US

Meanwhile, according to a study published in the Proceedings of the National Academy of Sciences and cited by the Guardian, the number of Covid-19 cases in the United States may have been underestimated by up to 60%. The University of Washington researchers’ survey is based on research that found that the number of reported cases “represents only a fraction of the estimated total number of infections.”

The study incorporated data on deaths, the number of tests administered each day and the percentage that tested positive. Also incorporated data from randomly sampled people studies for Covid-19 in Indiana and Ohio. Random sample surveys provide strong evidence of the true prevalence of a disease because they don’t rely on people looking for tests, who often fail to catch asymptomatic infections. Based on the analysis of this data, the researchers found that as many as 65 million Americans may have been infected. Official counts place the number at around 33 million.

The researchers estimated that 60% of all cases were missed, with only one in every 2.3 cases counted in Indiana and Ohio. The case count held by Johns Hopkins University yesterday stood at nearly 34.5 million. The underestimates may “depend on the severity of the pandemic and the amount of testing in that state,” said Nicholas J Irons, study co-author and postdoctoral student. “If you have a state with a severe pandemic but limited testing, the undercount can be very high and you are missing out on the vast majority of infections that are occurring.”