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.

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