Illinois is seeing a "notable increase" in hospital admissions for flu cases, according to state health officials, as levels of respiratory viruses continue to tick up. But which type of flu is ...

and experts maintain there has been no evidence of sustained human-to-human spread, almost all influenza A cases that are occurring in the world are either H1 or H3, Adalja said. Dr. Rajendram ...

The team found that animals that had the virus inoculated directly into their lungs became severely ill, whereas animals that ...