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The U.S. Centers for Disease Control and Prevention (CDC) announced on Thursday that an analysis of samples from the first severe human case of bird flu in the United States revealed unusual mutations in the virus. These mutations, found in the hemagglutinin (HA) gene, play a crucial role in the virus’s ability to attach to host cells. The CDC emphasized that despite these changes, the risk to the general public remains low.
First Severe Case of Bird Flu in the U.S.
The case, which was reported last week, involved a Louisiana resident aged 65 or older who was suffering from severe respiratory illness. The patient was infected with the D1.1 genotype of the avian influenza virus, which has recently been found in wild birds and poultry across the U.S. This genotype is different from the B3.13 variant detected in human cases, some poultry, and dairy cows in other states.
Rare Mutations in HA Gene: What Does It Mean?
The CDC’s analysis found that the mutations in the HA gene were rare, though they have been reported in severe cases of bird flu in other countries. One of the mutations was also observed in a severe case in British Columbia, Canada. While these mutations are uncommon, they have raised concerns due to their potential role in more severe infections.
However, the CDC has stated that the mutations do not appear to increase the risk of transmission among humans. No evidence has been found to suggest that the patient in Louisiana transmitted the virus to others.
No Change in Public Health Risk
Despite the presence of mutations in the virus, the CDC assured the public that the risk from the bird flu outbreak remains low. The health body continues to monitor the situation closely, but as of now, the general public is not considered to be at significant risk.
