Summary:

- This article reports on a study that investigated the effectiveness of the Pfizer-BioNTech COVID-19 vaccine in preventing infection and severe disease caused by the Omicron BA.5 subvariant.
- The study found that the vaccine provided significant protection against Omicron BA.5 infection, with a vaccine effectiveness of 70% against infection and 83% against severe disease.
- The findings suggest that the Pfizer-BioNTech vaccine continues to provide important protection against the Omicron BA.5 subvariant, which has become the dominant strain in many parts of the world.