From VOA News:Scientists in the United States say they believe they have discovered what makes bird flu viruses so deadly to humans.
Researchers at St. Jude Children's Research Hospital in Memphis, Tennessee, say the culprit may be a protein found in the genes of many avian flu viruses. The scientists say this protein can attach to proteins in human cells.
They found the protein only in the avian flu viruses they sampled, and not in any of what are known as the human strains of the disease.
The researchers say this striking difference between the two viruses may explain why avian influenza is more lethal to people than human influenza.
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