COVID-19 vaccine effectiveness has plummeted for pregnant women and newborns since the Omicron coronavirus variant became the dominant strain in the United States, according to data presented by Centers for Disease Control and Prevention (CDC) officials on Oct. 19.
The effectiveness of two doses of a Pfizer or Moderna vaccine against emergency department and urgent care visits was 87 percent after two doses and remained high at 78 percent after 150 or more days while the Delta variant was predominant, according to data from the CDC-funded VISION network.
