Pfizer Says Booster Shot Protects Against Omicron

Pfizer announced that a booster dose of its COVID-19 vaccine offers strong protection against the Omicron variant. Lab studies indicate that a third dose generates neutralizing antibodies similar to those produced by two doses against the original virus. However, individuals with only the primary series showed a significant drop in antibodies against Omicron, suggesting that two doses may not suffice to prevent infection, though they might still avert severe disease.

What has Pfizer announced about its COVID-19 vaccine booster?

• It is not needed for Omicron.

• It is only effective against the original virus.

• It provides strong protection against Omicron.

• It is less effective against Omicron.

According to lab studies, how does the third dose of Pfizer's vaccine compare to two doses against the original virus?

• It provides a similar level of neutralizing antibodies.

• It provides no protection.

• It provides less protection.

• It provides more protection.

What did blood samples reveal about antibody levels in those who only received the primary series of the vaccine?

• Antibody levels remained constant.

• There was a 25-fold drop in antibodies.

• There was a 25-fold increase in antibodies.

• There was no change in antibody levels.

What might two doses of the vaccine still prevent, despite not being sufficient against Omicron infection?

• No disease

• All infections

• Severe disease

• Mild disease

What does the drop in antibodies against Omicron suggest about the primary series of the vaccine?

• It may not be enough to prevent infection.

• It is sufficient to prevent all infections.

• It provides complete protection.

• It is more effective than the booster.