Diseases, Conditions, Syndromes

Human cases of bird flu 'an enormous concern': WHO

The World Health Organization voiced alarm Thursday at the growing spread of H5N1 bird flu to new species, including humans, who face an "extraordinarily high" mortality rate.

Medical research

Study confirms how RNA chemical modifications benefit HIV-1

A chemical modification in the HIV-1 RNA genome whose function has been a matter of scientific debate is now confirmed to be key to the virus's ability to survive and thrive after infecting host cells, a new study has found.

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