Prognosis
Israeli Vaccine Campaign Took Three Weeks to Curb Spread
- Pfizer vaccine was highly effective at reducing severe cases
- Logistical challenges may reduce vaccine efficacy, study says
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Israel, with the highest proportion of citizens vaccinated against Covid-19 in the world, found it took three weeks for the Pfizer Inc.-BioNTech SE shot to start curbing new cases and hospitalizations.
Researchers in the Middle Eastern country reported preliminary observations Wednesday from a national immunization program that began Dec. 20. Improvement in the number of new cases and hospitalized patients occurred 21 days following the vaccination campaign, the scientists said, noting that the real-life effect of vaccines may take longer than what was demonstrated in clinical trials.