Prognosis
Pfizer Vaccine Results Leave Questions About Safety, Longevity
- More data coming from studies; distribution issues remain
- Effectiveness of 80% possible in older people: BioNTech CEO
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Covid-19 vaccine results from Pfizer Inc. and BioNTech SE fueled optimism that the world will soon have a potential way out of the pandemic, yet experts cautioned that the shot still has many hurdles to clear.