Blood Parasites Babesia and Theileria in Livestock
Blood parasites are known to Egyptian farmers as yellow fever or red urine, and they strike cattle, buffalo and sheep during the hot months when ticks are active. Babesia destroys red blood cells, causing anaemia, jaundice and dark urine, while Theileria infects lymphocytes and produces enlarged lymph nodes with persistent fever. The two look alike, and treating one with the drug for the other can cost the animal its life.
The tick is the key: how infection spreads
Babesia is transmitted by hard ticks, especially the brown ear tick common on Egyptian cattle, while Theileria uses other tick species. The parasite passes during a blood meal and can also move from dam to fetus or through a contaminated needle. Ticks remain infected across generations, so neglecting tick control means the disease returns every season even if every case is treated.
Animals exposed to ticks for the first time become acutely ill, while previously exposed animals may carry the parasite without obvious signs and become a source of infection. That explains cases appearing in herds that look healthy after a new animal is introduced. Grazing near canals and wet land, unsprayed sheds and accumulated bedding all raise tick numbers.
Babesiosis: anaemia and red urine
Babesiosis opens with fever of 40 to 42 degrees Celsius, loss of appetite and weakness, then pale mucous membranes and obvious yellow jaundice. Urine turns dark red or brown as haemoglobin is released from destroyed red cells, a late but distinctive sign. Nervous signs can appear in some strains when clumped cells block small vessels.
The animal loses weight quickly and milk falls sharply, and pregnant females may abort. Severe cases die within days from acute anaemia or kidney failure. Recovery does not remove the risk, because the animal remains a carrier and needs follow-up and continued tick control to protect the rest of the herd.
Theileriosis: swollen glands and prolonged fever
Theileriosis starts with high fever lasting days and obvious enlargement of lymph nodes, especially the prescapular node, which can swell to the size of an egg. Gradual pallor and weight loss follow, and the parasite may affect the lungs causing difficult breathing, or the eyes causing discharge and ulcers. Chronic cases leave the animal thin for weeks and reduce fertility.
The practical difference is that red urine is rare in theileriosis, while the leading signs are swollen glands and persistent fever that does not respond to ordinary antibiotics. Many farmers treat the animal for pneumonia or simple fever, losing precious time before the correct diagnosis.
Diagnosis, treatment and tick control
Diagnosis starts with a thin blood smear stained with Giemsa and examined under the microscope for parasites inside red cells, or a lymph node smear in theileriosis. PCR is more sensitive and detects early and carrier infections. Blood drugs are not bought at random, because the choice depends on the parasite species and on liver and kidney status.
Treatment uses specific drugs given under veterinary supervision, with fluids and blood transfusion in severe cases and vitamins to support appetite. Tick control is the real prevention: spray or dip animals every two to three weeks during the active season, rotate active ingredients to avoid resistance, and spray sheds and cracks. Build your spraying programme with an appropriate product such as sebason, support immunity with mineral salts from livestock vitamins, and follow livestock and sheep plus pest control.
- Check ears, tail area and udder weekly for ticks.
- Spray or dip animals every two weeks during the hot season.
- Rotate the active ingredient each season to prevent tick resistance.
- Isolate affected animals with dedicated needles and equipment.
- Do not treat persistent fever with antibiotics without a diagnosis.
- Request a blood smear or PCR test when blood parasites are suspected.
Conclusion
Babesia and Theileria are not treated by guesswork but by a blood smear, an accurate diagnosis and specific drugs under veterinary care. Treatment without tick control is like patching a leaking bucket, and real prevention starts with spraying animals and sheds.
This article is general guidance and is not a substitute for examining your animal by a licensed veterinarian. In emergencies, contact your vet immediately.
