Babesia (Babesiosis)

Babesiosis in Cattle: Understanding Babesia and “Redwater Disease”

By Newton Adera

Last Saturday, while observing the cattle on our ranch, I noticed an older cow that appeared unusually weak and did not respond normally to my usual observations. I quickly reported the matter so that the animal could be assessed.

This experience reminded me how important it is for livestock farmers to observe their animals closely and report unusual signs early.

In this article, I would like to discuss babesiosis, a serious tick-borne disease of cattle commonly associated with Babesia parasites.

What Is Babesiosis?

Babesiosis is a disease caused by microscopic protozoan parasites of the genus Babesia. In cattle, an important species is Babesia bigemina.

The parasite is transmitted mainly by ticks. In East Africa, the blue tick, Rhipicephalus (Boophilus) decoloratus, is an important vector of B. bigemina.

Babesiosis is commonly known as “redwater disease” because affected cattle may develop reddish or dark urine. This occurs when the parasite destroys red blood cells, releasing haemoglobin into the bloodstream and subsequently into the urine.

Babesia species can infect a range of domestic and wild animals, although the particular species of Babesia and its tick vectors vary between animal hosts and geographical regions.

Babesia Bigemina in Cattle

The term bigemina should not be very strange to livestock farmers.

When examined under a microscope in a properly prepared and stained blood smear, Babesia bigemina parasites can appear as relatively large organisms inside red blood cells. They commonly occur as paired forms, which is associated with the name bigemina.

However, diagnosis should be made by a qualified veterinary professional or laboratory rather than by visual observation alone.

Signs and Symptoms of Babesiosis

The signs of babesiosis can sometimes resemble those of other cattle diseases, including anaplasmosis. This is one reason why laboratory examination and professional diagnosis are important.

Farmers should watch for signs such as:

- High fever

- Loss of appetite

- Weakness and depression

- Rapid breathing

- Weight loss

- Pale or yellowish mucous membranes

- Anaemia

- Red, dark or coffee-coloured urine, particularly in severe cases

- Jaundice

- Reduced milk production

- Constipation or diarrhoea in some affected animals

- Abortion in pregnant cows in severe cases

- Temporary infertility in bulls following severe fever

The severity of disease can vary considerably depending on factors such as the animal's age, previous exposure, immunity, parasite strain and the presence of other infections.

Why Is Red Urine Important?

Red or dark urine is one of the signs that may alert a farmer to babesiosis, but it should not be used by itself to confirm the disease.

Other conditions can also cause abnormal urine colour. Furthermore, babesiosis does not always produce obvious red urine.

This is why a veterinarian or animal health professional should examine the animal and, where appropriate, collect blood for laboratory testing.

Young Calves and Immunity

Babesiosis can affect cattle of different ages, but the clinical disease may be more severe in susceptible adult cattle than in calves that have acquired some degree of protection.

The situation is influenced by the calf's exposure to infection, immunity and management conditions. Protection associated with maternal antibodies can also play a role during early life.

Farmers should therefore be cautious when making major changes to tick-control programmes. Reducing tick exposure can be beneficial, but sudden changes in exposure patterns can alter the development and maintenance of natural immunity in cattle populations.

A local veterinarian or animal-health professional can advise on an appropriate tick-control programme for the farm.

Diagnosis of Babesiosis

Clinical signs can raise suspicion of babesiosis, but laboratory diagnosis is important for confirmation.

A veterinary professional may collect blood and examine a thin blood smear under a microscope for Babesia organisms inside red blood cells.

Blood samples may be collected from appropriate sites according to veterinary and laboratory procedures. In some circumstances, additional laboratory tests may be required when microscopy does not provide a clear diagnosis.

Farmers should not attempt to diagnose babesiosis simply by looking at the animal or its urine.

Babesiosis Can Occur Together With Other Diseases

Cattle in tick-infested areas can be exposed to more than one tick-borne disease.

Babesiosis may occur alongside diseases such as anaplasmosis or East Coast fever (ECF). Because these diseases can have overlapping clinical signs, proper diagnosis is particularly important.

If mixed infection is suspected, the veterinarian should determine the appropriate treatment for each condition.

Importantly, drugs used for ECF or anaplasmosis should not automatically be assumed to treat babesiosis. Different diseases require different treatments.

Treatment of Babesiosis

Babesiosis can be treated with specific antiprotozoal medicines, including drugs such as diminazene aceturate or imidocarb, depending on the diagnosis, product availability and veterinary guidance.

The correct drug, dose, route and withdrawal period should be determined by a qualified veterinarian or animal-health professional.

In severe cases, supportive treatment may also be necessary. A severely anaemic animal may require intensive veterinary care and, in some circumstances, a blood transfusion.

Do Not Treat on Symptoms Alone

This is particularly important because babesiosis can resemble other diseases.

A farmer should not inject a cow simply because it has fever, weakness or red urine. A veterinarian or qualified animal-health professional should assess the animal and determine the appropriate treatment.

Prevention: Control the Ticks

Because babesiosis is transmitted by ticks, effective tick management is an important part of prevention.

Farmers should:

- Monitor cattle regularly for ticks.

- Follow an appropriate tick-control programme.

- Use approved acaricides correctly.

- Follow the recommended dosage and application method.

- Observe meat and milk withdrawal periods where applicable.

- Avoid unnecessary or excessive use of acaricides.

- Maintain good herd health and nutrition.

- Report unusual illness or deaths promptly.

- Work with a veterinarian when changing tick-control programmes.

Prevention is better than waiting until an animal becomes severely ill.

What Should a Livestock Farmer Do?

If you notice a cow that suddenly becomes weak, develops a high fever, stops eating, produces unusually dark or red urine, or shows signs of anaemia or jaundice, take the situation seriously.

Do not wait for the condition to become advanced.

Separate the affected animal where appropriate, observe it carefully and contact a veterinarian or qualified animal-health professional as soon as possible.

Early reporting can make a significant difference because diseases such as babesiosis, anaplasmosis and East Coast fever can have similar clinical signs but require different approaches to treatment.

Final Thoughts

As livestock farmers, one of our most important responsibilities is to observe our animals every day.

The unusual behaviour of one cow may be the first warning that something is wrong. In my own observation on the ranch, noticing an older cow that was weak and behaving differently prompted me to report the matter quickly.

Babesiosis is a disease that every cattle farmer in tick-infested areas should understand. Learn to recognise the warning signs, maintain appropriate tick control and, most importantly, seek professional diagnosis before treatment.

Your observations as a farmer matter—but diagnosis and treatment should be guided by a qualified animal-health professional.

This article is intended for livestock education and does not replace veterinary diagnosis or treatment.