- US vaccine rollout was close to optimal at reducing deaths and infections, according to a model comparing 17.5 million alternative approaches. Although giving individuals with known risk factors earlier access to vaccines would have led to slightly better outcomes. https://theconversation.com/us-vaccine-rollout-was-close-to-optimal-at-reducing-deaths-and-infections-according-to-a-model-comparing-17-5-million-alternative-approaches-171656 10 comments science