The virus was later found in Egypt in the 1950s.
The virus first became recognized as a cause of severe human
meningitis or encephalitis (inflammation of the spinal cord
elderly patients during an outbreak in Israel in 1957.
WNV first appeared in North America in 1999, with cases in humans and
The subsequent spread in the United States is an important
milestone in the evolving history of this virus.
Equine disease was first noted in Egypt and France in the early 1960s.
Spreading The Virus
West Nile Virus was first isolated in an adult woman in the West Nile
District of Uganda in 1937.