But how long is the period of non contraction? Doesn't say:
The duration of immunity caused by the vaccine is as yet unknown.
https://news.yahoo.com/pfizer-covid-vaccine-90-percent-131038946.html8 hours ago · Pfizer announced on Monday that its coronavirus vaccine developed with BioNTech SE prevented 90 percent of infections in a trial with tens of thousands of volunteers, in a major step toward authorization of a vaccine for general use.The Pfizer vaccine trial enrolled 44,000 participants in
Pfizer says trials show its COVID vaccine is "more than 90 ...
https://www.cbsnews.com/news/pfizer-covid-vaccine-effective-data22 hours ago · Pfizer did, however,
strike a large-scale production and delivery deal with the U.S. government, worth up to $1.95 billion, to secure an initial 100 million doses of its vaccine, following its ...