Health Officials Keep Close Watch on Bird FluAn especially virulent strain of the bird flu has spread from Asia to Europe and Africa. Known as H5N1, the virus can infect humans as well as birds. World leaders and health officials are taking the threat of a pandemic seriously, and pressure is on to develop effective containment measures and treatments.
Health Officials Keep Close Watch on Bird Flu
A pandemic is feared if the virulent strain, now in Asia, Europe and Africa, jumps to humans.