But, it must be pointed out, the Russian vaccine, while it has been granted government regulatory approval, still has to complete final testing. Vaccines normally undergo five phases in their development – a pre-clinical testing using animals to see if it produces an immune response, Phase 1 Safety Trials using a small number of people, Phase 2 Expanded Trials using hundreds of people, Phase 3 Efficacy Trials using thousands of people in which it must prove effective in at least 50 percent, and final approval by government regulators.
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August 14, 2020