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... Researchers analyzed a Canadian health database of pregnant people diagnosed with COVID-19 from April 2021 to December 2022, covering the Delta and Omicron periods. Only 5 percent in Delta and 1.5 percent in Omicron of those vaccinated before diagnosis were hospitalized, compared with 13.5 percent and 5 percent of those who weren't vaccinated. The percentage of newborns who were preterm was also lower for people vaccinated during pregnancy, researchers report December 15 in JAMA.

The 2024-2025 COVID-19 vaccine provided kids extra protection from the disease on top of their immunity from past years' shots, infections or both. The vaccine was an estimated 76 percent effective against emergency department or urgent care visits for COVID-19"like illness in children nine months to four years old, compared with not getting the vaccine. That means 76 percent fewer of the vaccinated kids had emergency visits. The vaccine was an estimated 56 percent effective for kids five to 17 years old, researchers report December 11 in Morbidity and Mortality Weekly Report. The study looked at an electronic health network of nine U.S. states.

And a study of millions of people in France found that vaccinated adults had a lower risk of death from any cause. ...