Acute death, bloody discharge from opening of the body( oral, nasal, anal and eye)., petechie and others
Rift Valley fever (RVF) is an acute viral hemorrhagic fever that is most commonly seen in domesticated animals (such as cattle, buffalo, sheep, goats, and camels) and can also cause illness in people.
The RVF virus causes abortions in sheep and goats, leading to large-scale deaths in young lambs. Up to 95% can die within days.
The incubation phase is very short, and lambs can show signs of illness within one to three days of infection. Some die within just 12 hours. Newborn lambs are prime targets as their wool or hair is very short. Adult sheep show signs of weakness and sometimes bloody diarrhoea.
Bleeding from the nose also occurs.
Rift Valley Fever in sheep and goats (farmersweekly.co.za)
If you enter in the PubMed database "hemorrhagic fever sheep" you will retrieve many relevant publications.