Human Infections with Avian Influenza H5N1 Viruses

h5n1During the period 20 May to 15 Sep 2007, a total of 21 human cases of avian influenza A (H5N1) infection was reported to WHO from four countries (China, Egypt, Indonesia, and Vietnam). Fourteen (67%) of these cases were fatal.

Since 1 Dec 2003, a total of 328 human avian influenza A (H5N1) infection have been reported to WHO. Of these, 200 (61%) were fatal. All the human cases were reported from Asia (Azerbaijan, Cambodia, China, Indonesia, Iraq, Laos, Thailand, Turkey, and Vietnam) and Africa (Djibouti, Egypt, and Nigeria).

MMWR Weekly 28 Sep 2007 56 (3)

H5N1 influenza virus can also pass through a pregnant woman’s placenta to infect the foetus. Researchers also found evidence that the virus not only affects the lungs, but passes throughout the body into the gastrointestinal tract, the brain, liver and blood cells.

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