Fully vaccinated individuals who experience breakthrough infections of the highly transmissible and globally dominant Delta variant can still spread the virus to vaccinated household members, but at lower rates than those who are unvaccinated, a new British study suggests.
published in August that looked at the effectiveness of the Pfizer-BioNTech and AstraZeneca shots, the vaccines included in The Lancet study, showed that they remained effective against the Delta variant at 88 per cent with Pfizer and 67 per cent with the AstraZeneca version. Studies have also shown that while their effectiveness against Delta-driven hospitalizations also fell, they remained high overall.
“The ongoing transmission we are seeing between vaccinated people makes it essential for unvaccinated people to get vaccinated to protect themselves from acquiring infection and severe COVID-19, especially as more people will be spending time inside in close proximity during the winter months.” Seventy-one participants had the Delta variant and were mildly sick or showed no symptoms. Scientists tracked 205 household contacts for the Delta cohort through daily polymerase chain reaction testing. Sixty-two per cent, or 126 contacts, were fully vaccinated, 19 per cent, or 39 individuals, had received one dose, and 19 per cent, or 40 individuals, were unvaccinated.
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