Moderna, J&J, Pfizer in the U.S., Sanofi in France, AstraZeneca in Britain, have accelerated their efforts to have a vaccine ready by the fall. Moderna and Pfizer use new technologies. Astra Zeneca is working with Oxford University on a vaccine that builds on existing technologies. Both AstraZeneca and Sanofi are building capacity to make hundreds of millions of doses of the vaccine.
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