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Statistics show that as of March 14, 2021, there have been more than 119 million COVID-19 cases and nearly 2.
6 million deaths worldwide
.
Although high-income countries began implementing mass vaccination programs in December 2020, so far, only 439 million doses of vaccine have been vaccinated globally, which is equivalent to 5.
COVID-19
In addition, even after vaccination, it is still strongly recommended to maintain social distancing and use masks, because existing vaccines cannot completely prevent infection , and their role in preventing the asymptomatic transmission of COVID-19 is uncertain
.
At present, the demand for real-world data on maintaining social distancing and using masks to reduce the risk of COVID-19 has not yet been met.
Most of the existing evidence is based on modeling, using mainly community-level data.
The burden of disease is related to hospitalization or mortality assessment
.
These studies cannot simultaneously consider individual risk factors for infection, nor can they best assess the incubation period between interventions to maintain social distancing and use of masks and infection rates, because there is a large lag between the onset of symptoms, testing, and medical treatment.
Recently, researchers studied the relationship between community-level social distancing measures and personal use of masks and predicted COVID-19 risk in a large prospective cohort study composed of 198,077 participants in the United States
.
The predicted risk of contracting COVID-19 in communities with different social distances
The predicted risk of contracting the new crown of living in a community with different social distances The predicted risk of contracting the new crown of living in a community with different social distancesThe results show that people living in the most socially distancing communities have a 31% lower predicted risk of COVID-19 than those living in communities with poorer social distancing
.
Self-reported "always" use of masks is associated with a 62% reduction in the predicted risk of COVID-19 , in addition, even among individuals living in communities with poor social distancing
The predicted risk of COVID-19 is 31% lower for people living in the most socially distancing community compared to people living in the poorest socially distancing community.
Original source:
Original source:Sohee Kwonet al.
Sohee Kwon et al.
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