Reduced population movement within a subcity area is associated with a subsequent
decrease in COVID-19 incidence among residents of that subcity area. Policies that
reduce population mobility at the subcity level might be an effective COVID-19 mitigation
strategy, although they should be combined with strategies that mitigate any adverse
social and economic consequences of reduced mobility for the most vulnerable groups.
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Though many countries around the world have developed their own vaccine verification systems, often evolved from previous contact tracing apps, developing a reliable, secure and accurate system remains a challenge.
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Health authorities across the country are looking at ways to improve vaccine certificate security after
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