If you keep dairy cattle in East Africa, East Coast Fever (ECF) is the disease most likely to kill your best animals. It's caused by a parasite (Theileria parva) spread by the brown ear tick, and studies in Kenyan smallholder herds find it accounts for a large share of all cattle disease and a high proportion of deaths — hitting hardest in the high-grade and exotic (Friesian, Ayrshire) cows that produce the most milk and have the least natural resistance.
Why it's so dangerous for dairy farmers Indigenous zebu cattle in endemic areas often carry some resistance from early-life exposure. The improved dairy breeds you keep for milk usually don't — so when an infected tick bites, the disease can move fast and be fatal. The economics are brutal: you lose your highest-value animal, the one you've fed and bred for years.
The signs — learn them, because early action saves cows ECF typically shows 1–3 weeks after an infected tick bite: - Swollen lymph nodes — the earliest reliable sign. Feel the node in front of the shoulder (prescapular) and at the flank (prefemoral); in ECF they swell noticeably. Check these on any sick animal. - High fever that won't settle. - Difficult, fast breathing as the lungs fill (a late, grave sign). - Loss of appetite, rapid weight loss, dullness, drop in milk. - Watery eyes/nasal discharge, sometimes a frothy nasal discharge near the end.
Treatment exists but works best early Specific drugs (buparvaquone is the mainstay) can treat ECF, but they're expensive and far more likely to save the cow if given early — which is exactly why recognising swollen lymph nodes and acting fast matters. A cow already struggling to breathe is often too far gone. Call your vet at the first suspicion; don't wait to "see how she does."
Prevention — tick control is everything Because ECF is tick-borne, controlling the brown ear tick controls the disease: - Regular acaricide application — dipping or spraying on a strict schedule (see "Tick control for dairy cattle"). Consistency is what protects; an irregular program lets ticks (and ECF) back in. - Keep the environment less tick-friendly — manage bush and long grass around housing and paddocks where ticks lurk. - The "infection-and-treatment" vaccine (ITM, the "Muguga cocktail") — a live vaccine given with a simultaneous antibiotic that gives cattle lifelong immunity to ECF. Where available through veterinary services, it's a powerful tool, especially for valuable dairy animals and those being moved into endemic areas. Discuss it with your vet or local livestock officer.
The smallholder reality ECF is the disease that makes or breaks improved-dairy ventures in this region. A consistent tick-control routine, fast recognition, and — where you can get it — ITM vaccination of your high-value cows is the combination that keeps your best milkers alive.
Sources ILRI / CGIAR — East Coast Fever and the ITM vaccine. KALRO — Tick-Borne Disease Control in Kenya. Academia/LRRD — ECF prevalence in smallholder dairy herds, North Rift Kenya. Merck Veterinary Manual — Theileriosis.