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Pfizer-BioNTech said that two vaccine doses alone “may not be sufficient to protect against infection” by the Omicron variant, but could still protect against...

The research may help explain why people who are overweight and obese have been at higher risk of severe illness and death from...

The research may help explain why people who are overweight and obese have been at higher risk of severe illness and death from...

Federal officials point to the city’s mandate as a success story and a shield against new Covid outbreaks at hospitals and nursing...

  • Hospitals are Philadelphia’s largest employer. Despite concerns that employees would leave if they were required to get a Covid vaccine, the city’s mandate for health care workers has been a huge success. https://t.co/h97EePruj2 - view on twitter

A new study adds to evidence that common rapid tests may fail to detect some Omicron cases in the first days of...

  • “A negative result may not actually be a negative result,” said Anne Wyllie, a microbiologist at the Yale School of Public Health and an author of the new study. “People should not ignore high risk exposures. They should not ignore symptoms.” https://t.co/BXYwSvU8IL - view on twitter

In the lab, antibodies produced during an Omicron infection protected against Delta. If Omicron dominates in the real world, that could lead to a...

The breakthrough may lead one day to new supplies of animal organs for transplant into human...

  • For the first time, surgeons have successfully transplanted a genetically altered pig’s heart into a patient. The procedure may bring new hope to hundreds of thousands of people with organ failure. https://t.co/CENy3a4ro2 - view on twitter

In a study of members of the Armed Forces, people who developed multiple sclerosis first had Epstein-Barr...

The treatment, called Paxlovid, is likely to work against Omicron and could be available in the United States before the end of the...

A survey of more than 80,000 physicians estimated that women make 25 percent less than men over a 40-year...