Changes

==Signalment==

==Signalment==

'''Cattle, sheep, goats and humans''' are important hosts. This is due in part to their presence in huge numbers in epizootic areas and therefore ability to greatly '''amplify viral presence''' in a population and transmit to others.

 

''Bos Taurus'' cattle and other European breed imported into Africa appear highly susceptible to RVF. '''Indigenous breeds''' appear to be '''resistant''' to disease, as do pigs.

RVF causes severe disease in animals, mainly cattle, sheep, goats and camels, with sheep being more susceptible. ''Bos Taurus'' cattle and other European breed imported into Africa appear highly susceptible to RVF.  

 

Cats, dogs, rats and other rodents seem to be accidental hosts infected by mosquitoes.

Age is an important factor in determining the severity of the disease, young stock are more susceptible – 90% of infected lambs die whereas in adult sheep mortality can be as low as <10%. Small ruminants are also more susceptible. Pigs are resistant to low doses of RVF but high doses can cause viraemia.  

 

During an outbreak in Egypt RVF virus was also isolated from horses as well as camels.

Humans working closely with animals or ingesting raw animal products, e.g. in rituals, are most predisposed.

Other species (e.g. dogs and cats) have been infected experimentally and have become viraemic. The only species that are resistant are reptiles, birds and amphibians.

==Clinical Signs==

==Clinical Signs==