British researchers first began testing the vaccine in April in about 1,000 people, half of whom got the experimental vaccine. Such early trials are designed to evaluate safety and see what kind of immune response was provoked, but can’t tell if the vaccine truly protects.
from
https://www.reviewjournal.com/news/nation-and-world/coronavirus-vaccine-prompts-immune-response-in-early-uk-test-2077394/
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