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For vaccines, the agency said that if a product that has already received emergency use authorization needs modification to address the variant, guidance recommends that a determination of efficacy be supported by data from clinical immunogenicity studies, which would compare a recipient’s immune response to virus variants induced by the modified vaccine against the immune response to the authorized vaccine. ray ban rb4278 nbsp;"The gradual lifting of travel measures (or temporary restrictions) should be based on a thorough risk assessment, taking into account country context, the local epidemiology and transmission patterns, the national health and social measures to control the outbreak, and the capacities of health systems in both departure and destination countries, including at points of entry," the Organization wrote. ray ban rb4278 Congressional Republicans in recent weeks have highlighted the tug of war over the reopening of schools, which has put President Biden's administration and congressional Democrats in a difficult spot between the competing interests of some teachers unions in major cities, which oppose returning to classrooms without more protections, and parents who desperately want to see their children back in schools. ray ban rb4278 Burr over pre-pandemic stock trades- Phil Mickelson denies role in gambler's sentence commutation- Wall Street is 'losing its mind' as small investors are 'taking down the billionaires': Charles PayneCLICK HERE TO GET THE FOX NEWS APPTODAY'S MUST-READS:- Author of children’s book and husband charged with abusing their own kids- Tucker Carlson: Why are thousands of federal troops still in Washington. ray ban rb4278