Diseases, Conditions, Syndromes

Messenger RNA Covid vaccines 66% effective against Delta: US study

The effectiveness against infection of the Pfizer and Moderna COVID-19 vaccines dropped from 91 percent before the Delta variant became dominant to 66 percent afterwards, according to a large study of US health workers published ...

Diseases, Conditions, Syndromes

Global warming may limit spread of dengue fever, new research finds

Infection with dengue virus makes mosquitoes more sensitive to warmer temperatures, according to new research led by Penn State researchers. The team also found that infection with the bacterium Wolbachia, which has recently ...

Diseases, Conditions, Syndromes

More evidence suggests COVID-19 was in US by Christmas 2019

A new analysis of blood samples from 24,000 Americans taken early last year is the latest and largest study to suggest that the new coronavirus popped up in the U.S. in December 2019—weeks before cases were first recognized ...

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