Paris: As reports this week from Scotland and Israel - where much or most of the population have gotten COVID-19 jabs - confirm that vaccines largely prevent people from getting sick, another question is emerging: do they also block infection? A lot depends on the answer, experts say. If vaccines being rolled out worldwide ward off not only symptoms but the virus itself, it could sharply slow the pathogen’s spread and hasten the return to normalcy. “If the true impact on infections was very high, it would be great news because that is what we need for herd immunity,” Marc Lipsitch, director of the Centre for Communicable Disease Dynamics at the Harvard T.H. Chan School of Public Health, tol
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