A dangerous strain of bird flu is behaving in unprecedented ways, spreading through dairy cattle and showing signs of increased adaptation to mammals. The virus's evolution has health experts concerned about pandemic potential.
In February, the World Health Organization confirmed the first-ever Marburg virus disease outbreak in Equatorial Guinea. As of the latest WHO update from April 17, officials report 15 confirmed and 23 probable cases, with 34 deaths among them.
On March 29, the U.S. Food & Drug Administration authorized a second booster (fourth dose) of mRNA vaccines (Pfizer or Moderna) for people 50 years and up. The same day, Centers for Disease Control and Prevention recommended the same.
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