Medical Health Cluster


Effect of Covid-19 Vaccination on Transmission of Alpha and Delta Variants

In this study, 37% of 146,000 PCR-tested contacts of infected persons in England were positive for SARS-CoV-2. Transmission of the alpha variant from twice-vaccinated index patients was rarer than that from unvaccinated index patients (adjusted rate ratio with BNT162b2, 0.32). Vaccine protection waned over time and was more effective against […]

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‘The Fire That’s Here’: US Still Battling Delta Variant

While all eyes are on the new and little-understood omicron variant, the delta form of the coronavirus isn’t finished wreaking havoc in the U.S., sending record numbers of patients to the hospital in the Midwest and New England. “Omicron is a spark that’s on the horizon. Delta variant is the […]

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Effectiveness of the mRNA-1273 Vaccine during a SARS-CoV-2 Delta Outbreak in a Prison

The mRNA vaccines have been shown to be highly effective in preventing severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and associated illness,1,2 although recent reports suggest reduced effectiveness against infection with the B.1.617.2 (or delta) variant.3,4 We assessed the effectiveness of the mRNA-1273 (Moderna) vaccine among incarcerated men during a coronavirus […]

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Delta Variant Doubles Hospitalization Risk

People who contract the Delta variant have double the risk of hospitalization, as compared with earlier versions of the coronavirus, according to a new study published Friday in The Lancet Infectious Diseases. Based in England, the large study found that the Delta variant led to a higher rate of hospital admission and emergency care, with […]

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How Well Does COVID-19 Vaccination Protect Against the Delta Variant?

In a U.K. observational study, two doses of the Pfizer-BioNTech and Oxford/AstraZeneca vaccines had 88% and 67% effectiveness, respectively, against the Delta variant. As the Delta (B.1.617.2) SARS-CoV-2 variant fuels a global surge in COVID-19, an urgent clinical question concerns how effective the available vaccines are against this variant. Using […]

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