8. West Nile virus Flashcards
Incubation period
3 - 15 days
Clinical signs of WNV in horses
neurological disease
_______, usually in the hind limbs, is sometimes followed by paralysis.
Coma and death may occur.
Weakness
Is fever present in all cases of WNV?
NO
Fever has been seen in some but not all cases.
Many species of ____ are resistant to the disease.
birds
Susceptible birds such as ______ show various degrees of neurologic involvement ranging from lying down to leg and wing paralysis.
geese
Mortality rate of WNV in geese?
2-=60%
Some bird species are more susceptible to the virus than others, especially what family?
Corvidae (crow)
On poultry or game bird farms, outbreaks have been reported in (3)
1) geese
2) chukar partridges
3) Impeyan pheasants
Affected wild birds are usually found ____, and the clinical signs in many species have not been well described.
dead
Mosquitoes of the genus
__________ are generally considered the principal vectors of WNV
Culex (C. pipiens)
How WNV is transmitted? (3)
- contact with infected animals
- blood
- other tissues
Human illness has been classified into
two forms:
1) __________________
> a flu like illness
2) __________________
> cases with neurological signs
1) West Nile fever
> a flu like illness
2) West Nile neuroinvasive disease
> cases with neurological signs
Can WNV be asymptomatic?
YES
many WNV infections are asymptomatic
Is WNV a notifiable disease?
YES
