BREAKING THE EIMERIA CYCLE

An Integrated Strategy for Coccidiosis Control

INTRODUCTION

Coccidiosis remains one of the most important parasitic diseases affecting commercial poultry. The disease is caused by host-specific Eimeria species that multiply within intestinal epithelial cells, producing intestinal damage, impaired nutrient absorption, reduced growth and, in severe infections, mortality. Its economic impact is linked not only to clinical outbreaks but also to subclinical disease and reduced flock performance (Bera et al., 2010; Sharma et al., 2023; Pal et al., 2023).

Why it matters in modern poultry production

•Rapid multiplication of Eimeria can produce substantial intestinal injury within a short period.

•Subclinical coccidiosis may reduce feed efficiency, growth and flock uniformity without dramatic clinical signs.

•High oocyst contamination of litter increases exposure and repeated infection pressure.

•Effective control requires attention to parasite biology, farm management and appropriate anticoccidial programmes.

ETIOLOGY

Seven major Eimeria species are recognized in chickens. E. acervulina and E. maxima are frequently encountered, while E. tenella is particularly pathogenic and associated with severe caecal disease and haemorrhage (Yaqub et al., 2023). Species differ in preferred intestinal sites, lesion patterns and pathogenicity.

TRANSMISSION

The principal route is faecal–oral transmission. Birds ingest sporulated oocysts from contaminated litter, feed, water, equipment or the environment. Moisture, oxygen and suitable temperature favour sporulation, allowing infective oocysts to accumulate and maintain the infection cycle (Pal et al., 2023).

LIFE CYCLE OF EIMERIA

Ingestion of sporulated oocysts → release of sporozoites → epithelial invasion → multiplication → gamete formation → oocyst formation → faecal shedding → environmental sporulation.

CLINICAL SIGNS

Severity depends on Eimeria species, infective dose, bird age, immunity and environmental management. Signs include reduced feed intake, depression, ruffled feathers, drooping wings, enteritis, diarrhoea or dysentery, poor growth and increased mortality in severe cases (Pal et al., 2023).

•Reduced body-weight gain and flock uniformity

•Poor feed conversion and production performance

•Diarrhoea or blood-stained droppings in severe infections

•Dehydration, weakness and depression

•Mortality when tissue damage and blood loss are extensive

Species-specific sites

Species	Principal site / characteristic
E. tenella	Caeca; haemorrhage and caecal cores
E. necatrix	Proximal/mid small intestine; ‘salt-and-pepper’ appearance
E. acervulina	Upper small intestine; whitish patches
E. maxima	Small intestine; distension, thickening and mucus may occur

POST-MORTEM LESIONS

Post-mortem examination helps identify likely Eimeria species and estimate the distribution and severity of intestinal damage. Lesion patterns should be interpreted with clinical findings, litter condition, performance data and, where appropriate, laboratory diagnosis (Pal et al., 2023; Yaqub et al., 2023).

Key lesion patterns

Eimeria species	Main lesion site	Typical field finding
E. tenella	Caeca	Severe haemorrhage, thickened caecal walls and cores
E. necatrix	Small intestine	Haemorrhage with pale/white foci; ‘salt-and-pepper’
E. acervulina	Upper small intestine	Numerous whitish transverse/oval lesions
E. maxima	Middle/distal small intestine	Thickened/distended intestine with mucus

PREVENTION AND CONTROL

Effective control integrates anticoccidial programmes with litter management, hygiene, stocking-density control, ventilation and sound flock management. Continuous or inappropriate use of a single anticoccidial can contribute to reduced efficacy and resistance selection; rotation, shuttle programmes, combinations and vaccination are among approaches used for longer-term control (Usman et al., 2011; Chapman, 2017; Noack et al., 2019).

Anticoccidial programmes

•Rotation changes the active ingredient or mode of action between production cycles.

•Shuttle programmes use different anticoccidial strategies during different feed phases.

•Combination programmes can broaden anticoccidial activity and may help address reduced sensitivity when appropriately designed (Chapman & Rathinam, 2022).

•Vaccination can provide controlled exposure to selected Eimeria strains and support protective immunity.

Ionophore vs Chemical

IONOPHORES • Alter ion transport across parasite membranes. • Commonly used for prevention and control. • Useful in rotation strategies. • Examples: monensin, narasin, salinomycin, lasalocid.

CHEMICALS • Act through diverse biochemical targets in Eimeria. • Useful when a different mode of action is required. • Fit rotation/shuttle approaches. • Examples: nicarbazin, amprolium, diclazuril.

Combination programmes

Combining compatible anticoccidial activities can broaden control and reduce dependence on a single mode of action. Programme selection should consider disease pressure, previous anticoccidial history, susceptibility patterns, compatibility and label requirements (Chapman & Rathinam, 2022).

STALLEN’S DUAL APPROACH TO COCCIDIOSIS CONTROL

Stallen South Asia offers a dual approach to coccidiosis management with Manacox Plus, bringing together ionophore and chemical anticoccidial activity in one formulation. This approach is designed to support practical, structured coccidiosis-control programmes while reducing dependence on a single mode of action.

MANACOX PLUS

Manacox Plus is a dual-active anticoccidial formulation combining an ionophore and a chemical anticoccidial. It contains Monensin Sodium 8% + Nicarbazin 8% for practical coccidiosis prevention programmes in broilers.

Key Product Points

Composition	Monensin Sodium 80 g + Nicarbazin 80 g per kg; excipients q.s.
Indication	Prevention of coccidiosis in broilers and chickens reared for replacement of laying hens up to 16 weeks, caused by susceptible Eimeria species.
Dosage	500–600 g per ton of feed.
Withdrawal	1 day prior to slaughter.
Pack size	25 kg.

WHY A DUAL APPROACH

Using monensin sodium together with nicarbazin brings ionophore and chemical anticoccidial activity into one formulation. This can fit structured prevention programmes where the objective is effective control without unnecessary reliance on a single mode of action. Use should follow the approved label and veterinary guidance.

Practical use

•Use within a planned farm coccidiosis-control programme.

•Maintain good litter quality, ventilation, stocking density and drinker management.

•Review anticoccidial history and flock response when planning future programmes.

•Follow approved dose, withdrawal period and compatibility instructions.

REFERENCES

1.Bera AK, Bhattacharya D, Pan D, Dhara A, Kumar S, Das SK. (2010). Evaluation of economic losses due to coccidiosis in poultry industry in India. Agricultural Economics Research Review, 23(1), 91–96.

2.Pal M, Rebuma T, Tolosa T. (2023). Avian Coccidiosis: A Major Parasitic Disease of Poultry Industry.

3.Sharma R, Saran S, Tyagi JS. (2023). Indian poultry sector: Strategies for nutritional, socio-economic and environmental security.

4.Usman JG, Gadzama UN, Kwaghe AV, Madziga HA. (2011). Anticoccidial resistance in poultry: A review. New York Science Journal, 4(8), 102–109.

5.Yaqub M, Shah SA, Shafi M, Rafiq M, Goswami P, Kamil SA, Beigh AB. (2023). Pathological studies on coccidiosis in broiler and layer chicken.

6.Blake DP, Knox J, Dehaeck B, et al. (2020). Re-calculating the cost of coccidiosis in chickens. Veterinary Research, 51, 115.

7.Chapman HD. (2017). The use of anticoccidials in poultry production: An update. Poultry Science, 96, 1019–1025.

8.Chapman HD, Rathinam T. (2022). Focused review: The role of drug combinations for the control of coccidiosis in commercially reared chickens. International Journal for Parasitology: Drugs and Drug Resistance, 18, 32–42.

9.Mesa-Pineda C, Navarro-Ruíz JL, López-Osorio S, Chaparro-Gutiérrez JJ, Gómez-Osorio LM. (2021). Chicken Coccidiosis: From the Parasite Lifecycle to Control of the Disease. Frontiers in Veterinary Science, 8:787653.

10.Noack S, Chapman HD, Selzer PM, et al. (2019). Anticoccidial drugs of the livestock industry. Parasitology Research, 118, 2009–2026.

11.Peek HW, Landman WJM. (2011). Coccidiosis in poultry: Anticoccidial products, vaccines and other prevention strategies. Veterinary Quarterly, 31, 143–161.

12.Shirley MW, Smith AL, Tomley FM. (2005). The biology of avian Eimeria with an emphasis on their control by vaccination. Advances in Parasitology, 60, 285–330.