U.S. Pledges $1.2 Billion For Experimental Vaccine Doses

The US has committed $1.2 billion to AstraZeneca for 300 million vaccine doses, with clinical trials starting in April. The doses will be stored until proven effective. AstraZeneca is confident in the vaccine's potential, expecting all doses by December or January. Operation Warp Speed aims for a widely available vaccine by 2021, with phase three trials involving 300,000 US volunteers.

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