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The researchers examined 11,123 hospital admissions and emergency department visits that did not result in hospitalization for acute respiratory infection for this study. The researchers looked at Kaiser Permanente patient records in Southern California from December 1, 2021, to February 6, 2022, when both the delta and omicron variants were circulating in the population.

• After 2 doses of the Pfizer COVID-19 vaccine effectiveness against omicron was 41% against hospital admission and 31% against emergency department visits at 9 months.
  

• After 3 doses, effectiveness against omicron-related hospitalization was 85% at less than 3 months but fell to 55% at 3 months or longer.
  
  

Against emergency department visits that did not result in hospitalization, vaccine effectiveness of 3 doses against omicron was 77% at less than 3 months but fell to 53% at 3 months or longer.


https://scitechdaily.com/covid-19-third-...-3-months/