Research

Pfizer-BioNTech and AstraZeneca vaccines offer high protection against severe COVID-19, six months after second doses, study finds

Protection against severe COVID-19 by two doses of Pfizer-BioNTech and AstraZeneca COVID-19 vaccines remained high up to six months after second doses, finds new research which analysed NHS health record data on over seven million adults. Reassuringly, the University of Bristol-led study published in The BMJ today [July 20], found protection in older adults aged over 65 years, and in clinically vulnerable adults.

Infectivity of airborne SARS-CoV-2 could decrease by 90% within 20 minutes of exhalation, new laboratory study finds

The SARS-CoV-2 virus can lose 90% of infectivity when in aerosol particles within 20 minutes, according to new University of Bristol findings. The study, published in the journal of the Proceedings of the National Academy of Sciences (PNAS), is the first to investigate the decrease in infectivity of SARS-CoV-2 in aerosol particles over periods from seconds to a few minutes. The aim of the study was to explore the process that could change viral infectivity over short timescales following exhalation.