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Types of Bird Flu
Influenza and parainfluenza viruses are capable of causing severe illness. The influenza virus attacks many systems of the body simultaneously, but the primary site of viral replication appears to be the alveolar cells of the lung. There the virus multiplies many times over within a 24-hour period, and the pulmonary involvement may begin in the parenchyma and cause considerable consolidation and inflammation of lung tissue. It is common for there to be severe tracheitis, bronchitis, and bronchiolitis at the same time.
Bird Flu
also called avian influenza a viral respiratory disease mainly of poultry and certain other bird species, including migratory waterbirds, some imported pet birds, and ostriches, that can be transmitted directly to humans. The first known cases in humans were reported in 1997, when an outbreak in poultry in Hong Kong led to severe illness in 18 people, a third of whom died.
Between 2003 and late 2005, outbreaks of the most deadly variety of bird flu occurred among poultry in Cambodia, China, Indonesia, Japan, Kazakhstan, Laos, Malaysia, Romania, Russia, South Korea, Thailand, Turkey, and Vietnam. Hundreds of millions of birds in those countries died from the disease or were killed in attempts to control the epidemics. Concurrently, more than 100 cases of infection in humans were reported in Cambodia, China, Indonesia, Thailand, and Vietnam, with a roughly 50 percent death rate. Poultry-associated human infection with a less severe form of the disease was reported in The Netherlands.
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