The outbreak has so far been confined largely to the states of White Nile, Sinnar and Gezira.
Gezira is witnessing the greatest increase in human cases with most being reported in an area close to irrigation canals that is home to livestock and mosquitoes.
Transmitted by mosquitoes, RVF is a dangerous disease that affects both humans and livestock, including sheep, goats, cattle and camels.
Humans become infected through mosquito bites or direct contact with infected material and liquids such as animal blood during slaughtering. No cases of human-to-human transmission have been reported.
Symptoms include flu-like fever, muscle pain, headaches, joint pain, vomiting, loss of appetite and sensitivity to light. Patients can also experience lesions in their eyes, neurological problems, liver impairment and hemorrhagic fever symptoms, including widespread bleeding.
Social mobilization activities are now under-way to alert the local population to the human health risks associated with this disease in animals, said WHO.
