In a viral video, an Indiana physician baselessly claimed that the COVID-19 vaccines, which have been shown to be safe and effective, “fight the virus wrong and let the virus become worse than it would with native infection.” He also incorrectly said no vaccine prevents infection and contended that people previously infected with COVID-19 do not benefit from vaccination, despite studies that suggest otherwise.
Citing new data on the delta variant, the Centers for Disease Control and Prevention recommended that fully vaccinated people wear face masks indoors in some parts of the country.
Participants in the 2020 Olympic Games will be subject to many COVID-19 rules. But social media posts and a news report falsely claim athletes will be sleeping on specially made, flimsy “anti-sex beds” to prevent intimacy and COVID-19 infection. The beds were designed before the pandemic and can bear more than 400 pounds, the mattress company said.
Japan only recently adopted guidelines for accepting blood donations from those who have received COVID-19 vaccines. The guidelines are intended to give donors time to get over any side effects from the vaccine. Without providing that context, a social media post misleadingly claims Japan is “refusing” blood donations from vaccinated people.
Stanford Medicine says it “strongly supports the use of face masks to control the spread of COVID-19.” Yet viral stories falsely claim a “Stanford study” showed that face masks are unsafe and ineffective against COVID-19. The paper is a hypothesis, not a study, from someone with no current affiliation with Stanford. Update: The paper was retracted.
All of the authorized COVID-19 vaccines are effective at preventing symptomatic disease. Yet Fox News host Tucker Carlson baselessly casts doubt on the effectiveness of the vaccines, because federal officials urge fully vaccinated people to wear masks in public settings.
A study from the Centers for Disease Control and Prevention found that state-issued mask mandates were associated with significant decreases in daily COVID-19 case and death growth rates. Yet some conservative outlets and social media users falsely claim the study shows mask mandates have a negligible impact on COVID-19 outcomes.
Multiple lines of evidence back the use of face masks to protect against the coronavirus, although some uncertainty remains as to how effective mask interventions are in preventing spread in the community.
Lab tests, for example, show that certain masks and N95 respirators can partially block exhaled respiratory droplets or aerosols, which are thought to be the primary ways the virus spreads.
Observational studies, while limited, have generally found mask-wearing to be associated with a reduced risk of contracting the virus or fewer COVID-19 cases in a community.
In this video, SciCheck reviews a case study of how misinformation spreads online.
Since the Centers for Disease Control and Prevention began recommending that members of the public mask up last spring, additional research has backed the use of face masks to combat the coronavirus, but knowledge gaps still remain. Here, we summarize the evidence.