Coloured transmission electron micrograph of H5N1 virus particles
Science Photo Library
A tragic incident has occurred in Louisiana, as the state reports its first death from the deadly bird flu virus, H5N1. The Louisiana Department of Health (LDH) confirmed the fatality but assured the public that there have been no additional cases of H5N1 in the state and no evidence of human-to-human transmission.
The individual in question was hospitalized in December after coming into contact with infected or deceased birds in their backyard. Suffering from severe respiratory symptoms, this marked the first severe case of H5N1 in the United States. The LDH disclosed the news of the death on January 6, revealing that the victim was over 65 years old and had underlying health issues.
According to the US Centers for Disease Control and Prevention (CDC), a total of 66 individuals in the US have tested positive for H5N1. Most cases presented mild symptoms, such as eye redness, and were linked to contact with infected livestock like cows or chickens.
H5N1, a virus responsible for the deaths of millions of birds globally, has been circulating in dairy cows across the US for almost a year. Genetic analysis of samples taken from the Louisiana victim indicated infection with the D1.1 genotype of the virus, similar to strains found in wild birds but distinct from those affecting cattle. Fortunately, there is no evidence of human-to-human transmission of this virus.
The genetic analysis also revealed mutations that could enhance the virus’s ability to bind to human upper airway cells, which typically lack receptors for most avian flu viruses. The CDC suggests that these mutations likely occurred post-infection, as exposure to a bird flu virus can prompt evolutionary changes that improve its transmissibility. A similar mutation was observed in a severe H5N1 case in Canada in November.
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