Revolutionising poultry diagnostics with advanced molecular technology
Coccidiosis remains one of the most economically significant diseases affecting commercial poultry production worldwide. Caused by protozoan parasites of the Eimeria genus, the disease reduces growth rates, impairs feed conversion efficiency, increases mortality, and predisposes birds to secondary bacterial infections such as Clostridium perfringens, which can result in necrotic enteritis.
For South African poultry producers, veterinarians, and integrators, effective coccidiosis control depends on accurate diagnosis. While traditional diagnostic methods remain valuable, advances in molecular technology now make it possible to identify the exact Eimeria species present within a flock, providing a level of precision that was previously unavailable locally.
Envirocare Veterinary Laboratory is proud to offer South Africa’s first locally available molecular Eimeria species detection and quantification service, bringing world-class diagnostic capability to the South African poultry industry.
Understanding coccidiosis in poultry
Several Eimeria species infect chickens, with each targeting different areas of the intestinal tract and causing varying degrees of disease.
The most economically important species include:
- Eimeria tenella – responsible for severe caecal coccidiosis and significant mortality.
- Eimeria maxima – commonly associated with poor weight gain and reduced feed conversion efficiency.
- Eimeria acervulina – causes chronic intestinal damage and reduced production performance.
- Eimeria necatrix – produces severe intestinal lesions and substantial production losses.
- Eimeria brunetti
- Eimeria mitis
- Eimeria praecox
Mixed infections involving several species are common in commercial poultry operations, making accurate species identification increasingly important for effective disease management.
Traditional diagnosis versus molecular diagnostics
Routine monitoring for coccidiosis has traditionally relied on:
- Oocyst counting
- Microscopic examination
- Lesion scoring
- Clinical observations
These methods remain essential components of poultry health programmes, particularly for monitoring parasite burden and assessing flock health.
However, they have important limitations.
Microscopy cannot always distinguish between Eimeria species with confidence, particularly in mixed infections or when parasite numbers are low. Lesion scoring also depends on disease progression and observer experience, meaning infections may be missed during their early stages.
This is where molecular diagnostics provide a significant advantage.
Rather than estimating parasite burden alone, molecular testing identifies exactly which Eimeria species are present while simultaneously quantifying each species detected.
Why species identification matters
Knowing that coccidiosis is present is only part of the diagnostic picture.
Understanding which Eimeria species are responsible allows poultry veterinarians and producers to make more informed management decisions.
Species-level identification supports:
- Selection of appropriate control strategies.
- Monitoring of vaccine performance.
- Evaluation of anticoccidial rotation programmes.
- Detection of mixed infections.
- Monitoring changes in parasite populations over time.
- Investigation of suspected treatment failures.
- Improved flock health management through evidence-based decision-making.
This additional level of diagnostic information enables producers to respond proactively rather than reactively.
Introducing South Africa’s first local molecular Eimeria detection and quantification service
Envirocare Veterinary Laboratory now offers a molecular assay capable of simultaneously detecting and quantifying the seven major Eimeria species affecting poultry in a single analysis.
The assay identifies:
- Eimeria acervulina
- Eimeria maxima
- Eimeria tenella
- Eimeria necatrix
- Eimeria brunetti
- Eimeria mitis
- Eimeria praecox
Previously, producers requiring this level of diagnostic testing often needed to send samples to overseas laboratories.
By providing this service locally, Envirocare significantly reduces turnaround times while offering rapid access to detailed diagnostic information.
Advantages of molecular Eimeria testing
Compared with conventional diagnostic methods, molecular testing offers several important benefits.
Accurate species identification
Precisely identifies the Eimeria species present, even in complex mixed infections.
High analytical sensitivity
Detects low-level infections before they become clinically significant or affect production.
Quantification of individual species
Measures the relative abundance of each detected species, providing additional insight into infection dynamics.
Vaccine monitoring
Supports evaluation of vaccination programmes by monitoring species prevalence following vaccination.
Anticoccidial programme evaluation
Assists veterinarians in assessing parasite population changes and reviewing control programmes over time.
Rapid turnaround
Local testing enables timely intervention and management decisions without international shipping delays.
PCR versus oocyst counting: What’s the difference?
Although both tests contribute to coccidiosis management, they answer different diagnostic questions.
| Oocyst Counting | Molecular Eimeria Detection |
|---|---|
| Measures parasite burden | Identifies individual Eimeria species |
| Microscopy-based | PCR-based molecular assay |
| Useful for routine flock monitoring | Ideal for species identification and mixed infections |
| Estimates oocyst numbers | Detects and quantifies each species present |
| Valuable for routine surveillance | Valuable for advanced diagnostics, vaccine monitoring and programme optimisation |
Rather than replacing oocyst counting, molecular testing complements traditional diagnostic methods by providing a much deeper understanding of the parasites affecting flock performance.
Sample types accepted
To simplify sample submission, Envirocare accepts multiple sample types, including:
- FTA cards
- Fresh faecal samples
- Intestinal scrapings
Sample handling
For optimal results:
- Keep samples refrigerated at approximately 4°C during transport.
- No specialised transport medium is required.
Applications for poultry producers and veterinarians
Molecular Eimeria detection is particularly valuable for:
- Commercial broiler operations.
- Layer farms.
- Breeder flocks.
- Veterinary diagnostic investigations.
- Vaccine monitoring programmes.
- Integrators managing multiple production sites.
- Research and surveillance projects.
Advancing poultry diagnostics in South Africa
The introduction of local molecular Eimeria species detection represents an important advancement for the South African poultry industry.
By combining rapid turnaround times with highly sensitive PCR technology, producers and veterinarians can gain a clearer understanding of the parasites affecting flock performance, allowing for more informed disease management decisions.
Together with traditional diagnostic methods such as oocyst counting and lesion scoring, molecular diagnostics provide another powerful tool for improving poultry health, productivity, and long-term profitability.
Submit your samples
Envirocare Veterinary Laboratory welcomes sample submissions from poultry producers, veterinarians, consultants, and integrators throughout South Africa.
Whether you are investigating reduced flock performance, evaluating vaccination programmes, or seeking species-specific diagnostic information, our molecular Eimeria testing service provides rapid, reliable, and actionable results.
Contact Envirocare Veterinary Laboratory
Email: info@envirocarelab.co.za
Tel: +27 18 294 4283
Website: https://envirocarelab.co.za/
References
- Blake, D. P., Knox, J., Dehaeck, B., Huntington, B., Rathinam, T., Ravipati, V., et al. (2020). Re-calculating the cost of coccidiosis in chickens. Veterinary Research, 51(115). https://doi.org/10.1186/s13567-020-00837-2
- Chapman, H. D. (2014). Milestones in avian coccidiosis research: A review. Poultry Science, 93(3), 501–511. https://doi.org/10.3382/ps.2013-03634
- Clark, E. L., Macdonald, S. E., Thenmozhi, V., Krishna, S. B., & Blake, D. P. (2017). Cryptic Eimeria genotypes are common across the southern but not northern hemisphere. International Journal for Parasitology, 47(14), 1059–1066. https://doi.org/10.1016/j.ijpara.2017.08.008
- Conway, D. P., & McKenzie, M. E. (2007). Poultry Coccidiosis: Diagnostic and Testing Procedures (3rd ed.). Blackwell Publishing.
- Fatoba, A. J., & Adeleke, M. A. (2018). Diagnosis and control of chicken coccidiosis: A recent update. Journal of Parasitology Research, 2018, Article ID 5649057. https://doi.org/10.1155/2018/5649057
- Kawahara, F., Taira, K., Nagai, S., Onaga, H., Onuma, M., & Nunoya, T. (2008). Detection of five avian Eimeria species by species-specific real-time polymerase chain reaction assay. Avian Diseases, 52(1), 652–656. https://doi.org/10.1637/8162-081407-Reg
- Williams, R. B. (2005). Intercurrent coccidiosis and necrotic enteritis of chickens: Rational, integrated disease management by maintenance of gut integrity. Avian Pathology, 34(3), 159–180. https://doi.org/10.1080/03079450500112195
