Three-Day Sickness (Bovine Ephemeral Fever) in Cattle

Incubation Period

Usually 2–4 days.

Peracute Signs

Sudden onset of fever (40–41.5°C)

Severe depression

Anorexia

Sudden drop in milk production

Acute Signs

General Signs

Stiffness, reluctance to move, muscle tremors, shifting lameness, arched back and recumbency

Respiratory Signs

Nasal discharge, Salivation, Tachypnea, Dyspnea

Musculoskeletal Signs

Swollen joints, Muscle pain, Difficulty rising, Paralysis in severe cases

Gastrointestinal Signs

Ruminal stasis, Constipation followed by diarrhea

Reproductive Effects

Temporary infertility, Occasional abortion

Recovery Phase

Most animals recover withi 1–3 days. Some animals may require several weeks for complete recovery.