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A study shows Pfizer's COVID-19 vaccine is 85% effective after one dose, reducing infections by 75%. It suggests delaying the second dose. Pfizer's vaccine can be stored in regular freezers, and trials are underway for pregnant women. Babies will be monitored for antibody transfer. Thanks to Kaiser Health News for the update.

What percentage effectiveness does Pfizer's vaccine have in preventing symptomatic illness after the first dose?

• 50%

• 85%

• 95%

• 70%

What reduction in overall COVID infections was found after the first dose of Pfizer's vaccine?

• 80%

• 75%

• 60%

• 50%

What new storage condition has Pfizer submitted to the FDA for its vaccine?

• Room temperature

• Ordinary freezers

• Refrigerators

• Ultra-cold freezers

How many pregnant women are involved in the Pfizer and Biontech vaccine study?

• 5,000

• 4,000

• 3,000

• 2,000

For how long will Pfizer monitor babies for antibody transfer after birth?

• 3 months

• 12 months

• 6 months

• 9 months