US regulators have authorised emergency use of two new boosters that target Omicron variants. Pfizer’s new booster dose, pictured, is authorised for people aged 12 and older and Moderna’s new shot is for adults 18 and older. Photo: Pfizer via AP
US regulators have authorised emergency use of two new boosters that target Omicron variants. Pfizer’s new booster dose, pictured, is authorised for people aged 12 and older and Moderna’s new shot is for adults 18 and older. Photo: Pfizer via AP

Explainer |
The latest coronavirus boosters target Omicron. Are they safe and effective?

  • FDA has authorised emergency use of Pfizer-BioNTech and Moderna boosters that target BA.4 and BA.5 variants of Omicron
  • Shots based on original strain still offer protection but the rapid virus evolution means newer variants can dodge protective antibodies they induce

US regulators have authorised emergency use of two new boosters that target Omicron variants. Pfizer’s new booster dose, pictured, is authorised for people aged 12 and older and Moderna’s new shot is for adults 18 and older. Photo: Pfizer via AP
US regulators have authorised emergency use of two new boosters that target Omicron variants. Pfizer’s new booster dose, pictured, is authorised for people aged 12 and older and Moderna’s new shot is for adults 18 and older. Photo: Pfizer via AP
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