VOICED : Primera dosis de vacuna anticovid de Pfizer es eficaz en un 85% tras 2-4 semanas

The Pfizer-BioNTech COVID-19 vaccine shows 85% efficacy after the first dose, according to a study conducted at Israel's Sheva Hospital and published in The Lancet. The study involved 9,109 healthcare workers, revealing that the vaccine's efficacy is 47% between days 1 and 14, and 85% between days 15 and 28 post-vaccination. The study also highlights the importance of the second dose to achieve 95% efficacy. Israel's vaccination campaign began on December 19, with a significant portion of the population receiving at least one dose, facilitated by an agreement with Pfizer to share biomedical data.

What is the efficacy of the first dose of the Pfizer-BioNTech vaccine after two to four weeks?

• 85%

• 95%

• 100%

• 47%

How many healthcare workers participated in the study conducted at Sheva Hospital?

• 7,500

• 10,000

• 8,000

• 9,109

What percentage of the study participants had received the first dose of the vaccine?

• 60%

• 90%

• 80%

• 70%

What was the efficacy of the vaccine between days 15 and 28 after the first dose?

• 100%

• 85%

• 47%

• 95%

What percentage of Israel's population had received at least one dose of the vaccine by the time of the study?

• 32%

• 47%

• 60%

• 50%