The World Health Organization (WHO) confirmed on April 24, 2023, the first fatal case of avian influenza A(H5N2) in Mexico. The victim was a 59-year-old resident of the state of Mexico who experienced symptoms including fever, shortness of breath, diarrhea, nausea and general malaise. Despite having no known interactions with poultry or other animals, the person sought medical attention on April 24 and died later that day.
Researchers detected the A(H5N2) virus in the victim's body on May 23, according to WHO reports. This strain of avian influenza is different from H5N1, which has been circulating among U.S. cattle but not yet making the leap from animals to humans.
The WHO reported that this strain had 'high pathogenicity.' Contact tracing was conducted for the case, revealing that only one of the 17 people who interacted with the victim reported a runny nose on May 28 or 29. None of these individuals tested positive for the virus.
In March, an outbreak of A(H5N2) was reported in a backyard poultry farm in Michoacán, Mexico. The WHO noted that this strain had not previously been detected in humans and urged caution due to its high pathogenicity.
The risk posed by this virus to the general population is currently low, according to the WHO. However, it emphasized that A(H5N2) viruses have previously been reported in poultry in Mexico.