Friday, February 3, 2023

COVID vaccines slash risk of spreading Omicron — and so does previous infection

"Decreases in transmission of the delta variant were greater after two BNT162b2 vaccinations"

"The team found that among individuals with COVID-19, those who received at least one vaccine shot were 24% less likely to infect close contacts"

"This study confirms that COVID-19 vaccination reduces the risk of delta variant infection and also accelerates viral clearance in the context of the delta variant. However, this study unfortunately also highlights that the vaccine effect on reducing transmission is minimal in the context of delta variant circulation. These findings have immediate public health implications. Higher vaccination coverage rates need to be achieved because indirect protection from vaccinated to unvaccinated people remains suboptimal."

"Pfizer vax did reduce transmission of early variants"

"Researchers in the United Kingdom reported in a February observational study that Pfizer's vaccine helped cut transmission of the alpha and delta variants."

"Scientific studies show that the Pfizer-BioNTech COVID-19 vaccine reduces transmission"

"However, when booster vaccine doses reduce the risk of infection (as shown in the study by Spitzer et al2), then these boosters will also prevent transmission. As with all infectious diseases, the pathogen is required to cause the disease, and SARS-CoV-2 infection is the sine qua non for COVID-19. Prevention of infection results in prevention of potential onward transmission from all individuals who are spared the infection."

"New research suggests COVID-19 vaccines can slow the spread of disease, even with Omicron"

"Early data suggest infections in fully vaccinated persons are more commonly observed with the Delta variant than with other SARS-CoV-2 variants. However, data show fully vaccinated persons are less likely than unvaccinated persons to acquire SARS-CoV-2, and infections with the Delta variant in fully vaccinated persons are associated with less severe clinical outcomes. Infections with the Delta variant in vaccinated persons potentially have reduced transmissibility than infections in unvaccinated persons, although additional studies are needed."

"Instead, it's the principle that the UKHSA identified above: if you don't get infected in the first place thanks to a vaccine, you can't spread it. Once you're infected, you still can"

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