Covid-19 vaccine from Pfizer and BioNTech shows positive results
An experimental Covid-19 vaccine being developed by the drug giant Pfizer and the biotech firm BioNTech spurred immune responses in healthy patients, but also caused fever and other side effects, especially at higher doses.
The first clinical data on the vaccine were disclosed Wednesday in a paper released on MedRXiv, a preprint server, meaning it has not yet been peer-reviewed or published in a journal.
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