Stopping the Spread: Practical Approaches to Cryptosporidium Control

written by Kirsty Tamilia, CCF Calf & Youngstock Specialist

Background of Cryptosporidium

Cryptosporidium is a protozoan parasite that infects the gastrointestinal tract of mammals. In farm animals, the most common species are:

• Cryptosporidium parvum – affects pre-weaned calves and lambs, as well as being a zoonotic risk to humans.
• Cryptosporidium bovis and Cryptosporidium ryanae – affects post-weaned calves and young cattle.
• Cryptosporidium andersoni – affects adult cattle.
• Cryptosporidium ubiquitum – rarely seen in sheep.

C.parvum is a major cause of neonatal diarrhoea in calves and lambs worldwide. Cryptosporidium is transmitted via the faecal–oral route, with oocysts shed in faeces becoming immediately infective in the environment. There is also risk of spread through ingestion of contaminated food or water, making hygiene highly important. It takes only 5 oocysts to create an active infection, whilst millions of oocysts are shed once an active infection is present – meaning Cryptosporidium is highly virulent (MSD Animal Health).

Cryptosporidium infection typically presents itself in a watery, profuse diarrhoea as well as dehydration and poor performance in young animals, whilst adult animals can present sub-clinically (Kadukova et al., 2024).

Practical Challenges of Cryptosporidium

There are many challenges that are associated with having a Cryptosporidium infection on the farm, with the main consequences being loss of productivity resulting in economic losses. This can be presented as the following:

• Increased treatment usage for infected animals.
• Possible mortality losses in severe cases.
• Weakened immune system and impaired gut function, acting as a gateway to secondary infections, impacting long-term resilience.
• Reduced farm efficiency = reduced growth rates resulting in increased days of life on farm (e.g. delayed slaughter age in lambs) or increased days to reach target weights (e.g. dairy heifers). Every extra day on farm is costing money but also increasing the CO2 production per kg of meat/milk.
• Often a hidden cost, the cost of extra labour to care for infected animals!

Even with low mortality, the hidden cost of reduced performance can be substantial.

Test before you Treat

Testing is a key aspect to identifying Cryptosporidium in an environment before treatment is discussed with your veterinary / SQP advisor. The Progiene Calf Scour Test Kit is a rapid, on-farm diagnostic tool used to identify the most common infectious causes of calf scours quickly. It’s designed for use directly in the calf housing. The test is a lateral flow, which gives visual confirmation of pathogen presence.

Purpose: Detect specific pathogens that commonly cause diarrhoea in young calves, helping to identify the most appropriate management plan.

The Progiene test kit identifies four major pathogens known to cause calf scours:

• Rotavirus
• Coronavirus
• E. coli F5 (ETEC / K99)
• Cryptosporidium parvum

Reasons to test:

✅ Early intervention: knowing the cause enables targeted therapy (e.g. hydration, targeted anti-microbials as advised by your veterinarian, etc)
✅ Biosecurity & management: Helps identify outbreaks in a group to ensure on farm hygiene and isolation protocols are adhered to.

How It Works:

1. Collect a faecal sample directly from the calf’s rectum. If the faeces are liquid, a spoonful is enough; if solid, remove excess first.
2. Mix the sample in the provided buffer tube and shake to homogenise.
3. Apply drops of the processed sample to the test cartridge wells.
4. Wait about 10 minutes for results
5. Read the visual results: lines appear on the test strip showing which pathogen(s) are present. Refer to a veterinary / SQP professional for further guidance.

These tests don’t replace informed advice — they guide early decisions on farm.

High quality targeted electrolytes are advised to rehydrate the animal

Proper sample collection and hygiene (gloves, clean tools) are essential for reliable results.

Stop the Spread from the Shed

Early-life nutrition plays a major role in reducing the risk and severity of Cryptosporidium infection in neonates. While nutrition cannot fully prevent infection, it significantly strengthens resistance, improves gut health, and reduces clinical impact. This includes both optimising colostrum management and ensuring adequate energy intake post colostrum through high quality liquid feeding. For further information please contact CCF’s youngstock specialist.

Hygiene is one of the most important factors when it comes to rearing youngstock, whether discussing calves or lambs. It is good practice to ensure that all sheds are kept clean, dry and disinfected on a regular basis. When dealing with a Cryptosporidium infection in calves (caused by the parasite Cryptosporidium parvum), environmental cleaning is absolutely critical due to the oocysts extremely resistant nature. They can survive for months in damp bedding and buildings. So, how do we build a robust hygiene protocol to stop the spread from the shed?

• Environment Cleaning
  1. Remove organic matter – remove dirty bedding and pressure wash all surfaces including gates, troughs, walls etc.
  2. Use an effective disinfectant – refer to DEFRA approved disinfectants licenced for use against Cryptosporidium. Hydrogen peroxide–based disinfectants or Peracetic acid products also help to reduce the oocyst loading.
  3. Fresh air and sun light, Crypto oocysts are less likely to survive in UV light and if the shed is dry – so once cleaned out open those doors!
  4. Steam cleaning is an efficient way to reduce Crypto oocysts, if the temperature exceeds 60°

• Biosecurity
  1. Calf jackets must be washed at temperatures exceeding 60°c before being worn by the next calf.
  2. Feed from youngest (most immune challenged) → oldest (more resilient) calves.
  3. Clean feeding equipment with a cold rinse before a hot water and detergent wash. Ensure sufficient drying of equipment between feeds.
  4. Use footbaths containing an effective product upon entry and exit to the shed.
  5. Wear gloves whilst dealing with calves and wash hands thoroughly to avoid zoonotic potential.

This pathogen is of great importance from a calf and human health perspective. Cryptosporidium presence in drinking water sources poses a significant public health risk therefore it is vitally important to stop the spread from the shed!

This article is supported by Welsh Water, working in partnership with CCF to protect your drinking water sources for the future

References

Kaduková, M., Schreiberová, A., Mudroň, P., Tóthová, C., Gomulec, P. and Štrkolcová, G., 2024. Cryptosporidium infections in neonatal calves on a dairy farm. Microorganisms, 12(7), p.1416.