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Bovine Ephemeral Fever (BEF) is a viral disease of cattle and buffalo. Typically, affected animals are only sick for a few days, hence the alternative name - Three Day Sickness.
There is a sudden onset of fever- as high as 410C compared with the normal temperature of about 380C. The temperature returns to normal within 36 hours.
The first sign in milking cows is a sudden and severe drop in milk production. Cows in advanced pregnancy may abort. This is probably because of the fever, rather than a specific effect of the virus.
Animals stop eating and drinking and become depressed. They usually drool saliva, develop a stringy nasal discharge, and may have watery eyes.
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