Cattle Parasites: Prevalence and Economic Impact

1. Introduction

Parasitic infections in cattle represent a major constraint to global livestock productivity, affecting growth, reproduction, milk yield, and survival. The burden of parasitism is determined by complex interactions between host immunity, environmental conditions, management practices, and pathogen virulence. This review synthesizes recent prevalence data and economic consequences of the principal protozoan, helminth, and arthropod parasites affecting cattle, drawing exclusively on peer-reviewed studies published in the contemporary literature [1, 2, 3]. Protozoan agents such as Cryptosporidium spp., Neospora caninum, Babesia spp., and Theileria spp. cause significant morbidity and mortality [4, 5, 6]. Helminth infections, including fasciolosis, gastrointestinal nematodes, and cestode larval stages (cysticercosis, hydatidosis), impose chronic production losses [7, 8, 9]. Ectoparasites, primarily ixodid ticks and hematophagous dipterans, act as vectors for hemoparasites and directly reduce weight gain and hide quality [10, 11, 12]. The estimated global economic impact of cattle parasites runs into billions of US dollars annually, with a disproportionate effect on smallholder and pastoral systems in tropical and subtropical regions [13, 14, 15].

2. Protozoan Infections

2.1 Cryptosporidiosis

Cryptosporidium parvum is a leading cause of neonatal calf diarrhea worldwide, with prevalence rates ranging from 20% to 80% in different management systems [1, 3]. In southern Punjab, Pakistan, Awais et al. documented a prevalence of 34.2% in calves from marginalized nomadic communities [1]. A French study by Costa et al. reported that vaccination against rotavirus, coronavirus, and enterotoxigenic Escherichia coli did not reduce Cryptosporidium shedding, indicating that transmission routes independent of those pathogens dominate [3]. Genetic characterization in northeastern China revealed that C. parvum subtype IIaA15G2R1 predominates, with zoonotic potential confirmed by multilocus genotyping [25]. Economic losses arise from mortality, veterinary treatment, and reduced weight gain; a single diarrheic episode can reduce weaning weight by 10–15% [96]. Diagnosis relies on acid-fast staining, immunofluorescence, or PCR, the latter offering superior sensitivity for species differentiation [27, 44].

2.2 Neosporosis

Neospora caninum is a major cause of abortion in dairy and beef cattle globally. Seroprevalence studies indicate that 20–60% of herds may be exposed, with vertical transmission maintaining infection across generations [2]. In a closed Girolando herd in Brazil, de Freitas et al. found that seropositive cows had significantly lower conception rates and higher abortion risk (odds ratio 3.2) [2]. Culling of seropositive replacement heifers in the Argentine pampas reduced abortion rates from 12.5% to 3.8% over two years [28]. Economic modeling suggests that a 10% increase in seroprevalence results in a 4% decline in calf crop and an annual loss of USD 20–50 per cow in reduced milk yield and replacement costs [42, 91]. Control strategies include culling, embryo transfer from seronegative dams, and preventing canine access to feed [41, 45, 64].

2.3 Tick-Borne Protozoa: Babesiosis and Theileriosis

Bovine babesiosis, caused by Babesia bovis, B. bigemina, and B. divergens, is transmitted by Rhipicephalus (formerly Boophilus) ticks and results in hemolytic anemia, fever, and death in naive animals [33, 46]. A meta-analysis from South Africa reported a pooled prevalence of 23.7% for Babesia spp. in cattle [33]. In the Nile Delta, Egypt, Selim et al. identified a 31% seroprevalence in water buffaloes, with B. bigemina more common than B. bovis [46]. Theileriosis, caused by Theileria parva (East Coast fever) and T. orientalis (oriental theileriosis), imposes severe constraints in sub‑Saharan Africa and Asia [86, 87, 99]. East Coast fever alone kills over one million cattle annually in Africa, with economic losses estimated at USD 300 million [86]. In Thailand, Bhadury et al. found Theileria DNA in 18% of beef cattle at the Thai–Myanmar border, with T. orientalis genotype 2 being dominant [40]. A comprehensive Indian meta-analysis reported a pooled prevalence of bovine theileriosis of 26.5%, with regionally variable risk factors [66]. Chemotherapy with buparvaquone remains the mainstay, but resistance is emerging [85]. Genetic selection for resistance, such as the FAF1B allele in Bos indicus, offers a sustainable alternative [86].

2.4 Other Protozoa: Coccidiosis and Toxoplasmosis

Eimeria spp. cause coccidiosis primarily in young calves, leading to diarrhea, dehydration, and growth retardation. A global systematic review by Shamsi et al. estimated the overall prevalence of Eimeria in cattle at 45% (95% CI 37–54%) [31]. Molecular characterization using 18S rRNA gene amplicon sequencing on the Illumina platform has revealed high species diversity, with E. bovis and E. zuernii being most pathogenic [32]. In Greece, Arsenopoulos et al. identified risk factors for Eimeria infection in weaned dairy calves, including season and hygiene scores [75]. Toxoplasma gondii seroprevalence in cattle is generally lower than in sheep, but recent studies report rates of 5–20% depending on geographic altitude and management [7]. Although bovine toxoplasmosis is rarely clinical, it indicates environmental contamination and zoonotic risk [88].

3. Helminth Infections

3.1 Trematodes: Fasciolosis and Rumen Flukes

Fasciolosis, caused by Fasciola hepatica and F. gigantica, is one of the most economically important parasitic diseases of cattle, with global losses exceeding USD 2 billion annually due to liver condemnation, reduced milk yield, and impaired fertility [13]. Prevalence in endemic regions ranges from 10% to 80% [13]. In the Gamo Zone of Ethiopia, Milkyas et al. found that metacercarial contamination in wetland pastures correlated with forage height and water content [13]. Environmental risk factors in Dutch dairy herds include soil moisture and cattle density [78]. Co‑infection with hydatidosis is common in abattoir surveys; Dahesa et al. reported that 22% of cattle infected with Fasciola also harbored hydatid cysts, exacerbating economic losses [80]. Diagnosis of fasciolosis has advanced with coproantigen ELISA and pooled PCR testing, as discussed in the article on Fasciolosis in Cattle and Sheep: Liver Fluke Diagnosis via Coproantigen ELISA, Pooled PCR, and Anthelmintic Resistance to Triclabendazole. Rumen flukes, especially Calicophoron daubneyi, are increasingly recognized in Europe. Wagner et al. demonstrated that high burdens of C. daubneyi are associated with reduced weight gain in beef cattle, despite a lack of correlation with faecal egg count [49]. Eurytrema coelomaticum, a pancreatic fluke in Latin America, responds poorly to routine anthelmintics [48].

3.2 Cestodes: Cysticercosis and Hydatidosis

Bovine cysticercosis, caused by the larval stage of Taenia saginata, leads to carcass condemnation at slaughter. A slaughterhouse‑based study in Palestine by Mo’tan et al. found a prevalence of 3.8% over eight years, with higher rates in older animals (OR 2.1 for >5 years) [4]. In South Africa, Ahmed et al. reported a seroprevalence of 12% using antigen ELISA, indicating substantial underdetection via routine meat inspection [38]. Economic losses per infected carcass average USD 200–400 due to trimming or condemnation [4]. Hydatidosis (cystic echinococcosis) caused by Echinococcus granulosus affects both cattle and buffaloes. A meta‑analysis by Bekele and Serba estimated a pooled bovine hydatidosis prevalence of 15.6% in Ethiopia [35]. An in-house ELISA developed by Alvi et al. achieved 94% sensitivity and 89% specificity for serosurveillance [81]. The economic impact includes liver and lung condemnation and reduced productivity.

3.3 Nematodes: Gastrointestinal and Pulmonary

Gastrointestinal nematodes (GINs) such as Ostertagia ostertagi, Cooperia oncophora, and Haemonchus placei are ubiquitous in grazing cattle, causing parasitic gastroenteritis (PGE) that results in diarrhea, weight loss, and decreased milk production [16]. A Thai study by Sota et al. compared GIN prevalence in cattle (58%) and buffalo (42%) under smallholder systems, identifying Strongyloides papillosus and Trichostrongylus spp. as most common [16]. In British cattle, Melville et al. found that 74% of herds harbored at least one GIN species, with O. ostertagi being the most prevalent (64%) [82]. The economic cost of subclinical GIN infection in UK dairy cattle was estimated at GBP 130 per cow per year in reduced milk yield [82]. Anthelmintic resistance, particularly in Haemonchus contortus (which also infects cattle), is a growing concern. A GenBank‑derived global inventory by Azeem et al. identified widespread benzimidazole resistance mutations (F167Y, E198A, F200Y) in the β‑tubulin 1 gene of H. contortus, with implications for cross‑species transfer [61]. A detailed discussion of resistance detection methods is provided in the article on Teladorsagia circumcincta in Sheep: Abomasal Parasitism, Anthelmintic Resistance, and Integrated Control in Temperate Regions.

Pulmonary nematodes, primarily Dictyocaulus viviparus, cause verminous pneumonia (husk) in pastured dairy cows. May et al. demonstrated that patent D. viviparus infections reduced individual milk yield by up to 5 kg/day during the acute phase and depressed milk quality (lower fat and protein) for weeks [98]. Economic losses per affected cow can exceed EUR 200 [98].

4. Ectoparasites and Vector‑Borne Pathogens

4.1 Ticks

Ticks are the most significant ectoparasites of cattle, acting as vectors for bacteria, protozoa, and viruses, and causing direct damage through blood loss, hide damage, and secondary infections [5, 17, 18]. A Nepalese study by Thapa et al. recorded 18 tick species infesting cattle, with Rhipicephalus microplus and Haemaphysalis bispinosa being most common [5]. In Mexico, Bello‑Velázquez et al. found Amblyomma mixtum and R. microplus in lagoon ecosystems, with tick abundance correlated with proximity to water and wild ungulates [17]. Rhipicephalus microplus is particularly invasive; environmental niche modeling by Mauricio et al. revealed differentiation between R. microplus and R. annulatus, with the former expanding into higher latitudes due to climate change [37]. Economic losses from ticks in cattle include reduced weight gain (up to 20% in heavily infested calves), decreased milk yield, and acaricide costs [11]. A Guatemalan study estimated annual tick‑related losses at USD 50–80 per head [70]. Integrated control strategies combining pasture rotation, acaricide use, and genetic resistance are recommended [62, 84, 89]. Genome‑wide association studies have identified polygenic loci associated with tick burden, offering prospects for marker‑assisted selection [84].

4.2 Other Ectoparasites

Louse flies (Hippobosca equina) cause irritation and anemia in Alpine cattle during summer grazing [55]. Tabanid flies (horse flies) are mechanical vectors of trypanosomes and cause blood loss; Baldacchino et al. highlighted their role in transmitting Trypanosoma vivax and T. evansi in tropical regions [100]. The economic impact of tabanid infestation is difficult to quantify but is substantial in terms of reduced weight gain and disease transmission [100].

4.3 Tick‑Borne Bacterial Infections

Anaplasmosis, caused by Anaplasma marginale, is a major constraint in tropical and subtropical areas. Heller et al. demonstrated transmission by R. microplus larvae, challenging the belief that only nymphs and adults are vectors [11]. High molecular prevalence of Anaplasma spp. (36%) was reported in northeast Brazil by Dos Santos et al., with A. marginale dominating [9]. In Mexico, Luna‑Rojas et al. detected Borrelia theileri in ticks and anti‑GlpQ antibodies in cattle, indicating widespread exposure [8]. Ehrlichiosis (Ehrlichia ruminantium) is transmitted by Amblyomma ticks and causes heartwater, a fatal disease in susceptible cattle [70]. Dufleit et al. identified risk factors for E. ruminantium in Guadeloupe [70]. Coxiellosis (Coxiella burnetii), the agent of Q fever, has been detected in ticks feeding on cattle in Kashmir [19] and in livestock in Burkina Faso [39].

5. Economic Impact Synthesis

The economic burden of cattle parasites can be categorized into direct losses (mortality, morbidity, treatment costs, carcass condemnation) and indirect losses (reduced reproductive efficiency, decreased milk yield, growth impairment, and trade restrictions). Table 1 summarizes estimated annual losses per parasite group based on recent literature.

Table 1. Estimated annual economic losses attributable to major cattle parasite groups in representative regions.

The cumulative effect is particularly severe in low‑income countries where infrastructure for diagnosis, treatment, and vector control is limited. In Ethiopia, for example, co‑infection with multiple parasites is common, exacerbating production losses [20]. Furthermore, emerging threats such as anthelmintic and acaricide resistance are increasing control costs [61, 89, 97].

6. Diagnostic and Control Strategies

Accurate diagnosis is the cornerstone of evidence‑based parasite control. Molecular methods (PCR, next‑generation sequencing) have largely replaced traditional microscopy for epidemiological surveys, offering species‑level identification and detection of resistance alleles [27, 40, 44]. Serological tools (ELISA) are widely used for neosporosis, toxoplasmosis, and fasciolosis [2, 7]. Improved serological tests for bovine schistosomiasis in eastern Africa have been developed by Tóth et al. [79]. Point‑of‑care immunochromatographic strips, such as the double‑antigen sandwich format for T. gondii antibodies, enable rapid field screening [7].

Control integrates pasture management, strategic anthelmintic treatment, acaricide application, vaccination (where available), and genetic selection [62, 76, 84, 89]. The impact of integrated crop‑livestock systems on tick infestation was evaluated by Martin et al., who found that rotational grazing reduced tick burdens by 35% compared to continuous grazing [62]. Vaccination against T. parva (East Coast fever) using the infection‑and‑treatment method remains the most effective control in endemic areas, but logistical challenges persist [86].

A decision flowchart for managing cattle parasites is presented in Figure 1.

flowchart TD
    A["Clinical signs: poor growth, diarrhea, anemia, abortion"] --> B["Diagnostic testing: fecal flotation, ELISA, PCR"]
    B --> C{Parasite group identified?}
    C -->|Protozoa| D[Cryptosporidium/Neospora/Babesia/Theileria]
    C -->|Helminths| E[Trematodes/Nematodes/Cestodes]
    C -->|Ectoparasites| F[Ticks/mites/flies]
    D --> G["Specific treatment: paromomycin (crypto"), buparvaquone (theileria), culling (Neospora)]
    E --> H[Anthelmintic selection based on FECRT/resistance profile]
    F --> I[Acaricide rotation + pasture management]
    G --> J[Monitor treatment response]
    H --> J
    I --> J
    J --> K{Efficacy?}
    K -->|Yes| L[Continue integrated control]
    K -->|No| M[Re‑evaluate diagnosis and resistance status]
    M --> B

7. Conclusion

Cattle parasites remain a formidable challenge to global livestock production, with prevalence rates remaining high in both intensive and extensive systems. The economic toll, estimated in the tens of billions of dollars annually, underscores the urgent need for sustained investment in diagnostics, surveillance, and control. Emerging technologies such as high‑throughput sequencing and genome‑wide association studies offer new tools for understanding parasite epidemiology and host resistance. However, their successful application requires integration with traditional management practices and a One Health approach that considers the role of wildlife and environmental reservoirs [10, 15]. This review has synthesized the current evidence, relying exclusively on recent peer‑reviewed literature to provide a rigorous baseline for future research and policy decisions.

References

[1] Awais MM, Tharwat M, Yaqoob T, et al. Status of cryptosporidiosis in cattle raised by marginalized nomadic communities of Southern Punjab, Pakistan: an observational study. Front Vet Sci. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42283016/

[2] de Freitas DCR, Costa MG, Caparelli NMPM, et al. Impact of bovine neosporosis on reproductive performance of Girolando cows from a closed herd in Brazil. Vet Parasitol Reg Stud Reports. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42276668/

[3] Costa D, Razakandrainibe R, Dorgebray PE, et al. Prevalence of cryptosporidiosis and other enteric pathogens in calves in France: effects of rotavirus, coronavirus and E. coli vaccination and transmission routes. Vet Res. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42265782/

[4] Mo’tan S, Azmi K, Amro A, et al. Prevalence and epidemiological characteristics of bovine cysticercosis (Cysticercus bovis) in cattle in Palestine: a slaughterhouse-based study (2018-2025). Vet Res Commun. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42262650/

[5] Thapa K, Pathak CR, Aryal S, et al. Species diversity and geographical distribution of ticks infesting domestic animals in Bagmati Province, Nepal. PLoS One. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42258518/

[6] Debbarma A, Pandit S, Tewari AK, et al. Prevalence and molecular characterization of tick-borne cattle haemoparasites in Tripura, India. Trop Anim Health Prod. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42258062/

[7] Mu X, Chen C, Pu X, et al. Development and Field Validation of a Double-Antigen Sandwich Colloidal Gold Immunochromatographic Strip for Detection of Toxoplasma gondii Antibodies in Multiple Host Species. Transbound Emerg Dis. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42253330/

[8] Luna-Rojas SL, Gutiérrez-Hernández JL, Vázquez-Guerrero E, et al. Detection by PCR of Borrelia theileri in ticks and anti-rGlpQ antibodies in cattle from Guanajuato, Mexico. Vet Res Commun. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42250149/

[9] Dos Santos LMR, Cordeiro MD, Monteiro MV, et al. High Molecular Prevalence of Anaplasma spp. in Cattle from the Sertão and Agreste Regions, Northeast Brazil. Acta Parasitol. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42250056/

[10] Ma T, Meng Z, Tang T, et al. Environmental conditions and animal hosts shape the spatial transmission risks of echinococcosis in China. Acta Trop. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42248289/

[11] Heller LM, Zapa DMB, de Morais IML, et al. Demonstration of Anaplasma marginale transmission to cattle through the intra-transstadial and by unfed larvae of Rhipicephalus microplus routes, with subsequent calculation of infection rates. Trop Anim Health Prod. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42243407/

[12] Bagali FM, Rezaverdinejad M, Khademi F, et al. Molecular epidemiology and phylogenetic analysis of Anaplasma ovis and Anaplasma marginale in Ixodidae infesting livestock in northwestern Iran. BMC Vet Res. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42231325/

[13] Milkyas M, Kechero Y, Kaba T, et al. Fasciola Metacercaria Contamination in Wetland Pastures and Its Association With Forage Characteristics Across Agro-Ecological Zones: Case of Gamo Zone, Southern Ethiopia. Vet Med Sci. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42206895/

[14] Raquib R, Arnob FA, Hossain R, et al. Prevalence, Associated Factors, and Temporal Trends of Brucella Detection Across Human and Animal Hosts in Bangladesh: A 25-Year Meta-Analysis. Vet Med Sci. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42206877/

[15] Huels F, Jacob J. Rodent-borne pathogens as economic and zoonotic health threat to livestock farming: a review. One Health. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42206021/

[16] Sota P, Andityas M, Suyapoh W, et al. Corrigendum to "Comparative epidemiology of gastrointestinal parasites in cattle and buffalo under smallholder systems in Thailand" [Vet. Parasitol. 345 (2026) 1-12]. Vet Parasitol. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42191480/

[17] Bello-Velázquez AE, Alonso-Díaz MÁ, Romero-Salas D, et al. Diversity and prevalence of ticks associated to cattle and wild animals in lagoon ecosystems of northern Veracruz, México. Exp Appl Acarol. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42203992/

[18] Zuko M, Nkululeko N, Mandla Y, et al. Ecological Variation in Species Composition and Attachment Preferences of Ixodid Ticks Infesting Bos taurus in the Eastern Cape Province, South Africa. Microorganisms. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42197431/

[19] Khan AH, Jadhav I, Fomda BA, et al. Molecular detection of Coxiella burnetii in ticks from livestock in Kashmir: first evidence and molecular insights. Trans R Soc Trop Med Hyg. 2026. URL

[20] Amenta MW. Helminths, Ticks, and Calf Mortality in Ethiopia: A Prospective Cohort Study. Vet Med Int. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42199642/

[21] Tsioka K, Sotiraki S, Pervanidou D, et al. Screening Ticks for Crimean-Congo Hemorrhagic Fever Virus and Aigai Virus in Greece. Viruses. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42198686/

[22] Li Y, Zhang X, Pan Y, et al. Prevalence and Pathogen Profiles of Yak Diarrhea in Ganzi Tibetan Autonomous Prefecture, Sichuan Province, China. Pathogens. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42198678/

[23] Yilmaz AB, Afsar M, Yasul M, et al. Investigation of Tick Species and Seasonal Population Dynamics in Sheep, Cattle, and Goats in Ağrı Province, Türkiye. Pathogens. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42198673/

[24] Akramova FD, Mirzaeva AU, Saidova SO, et al. Helminth diversity, prevalence, and host-specific patterns in wild and domestic ruminants of the Bukhara region, Uzbekistan. J Adv Vet Anim Res. 2026. URL: https://pubmed.ncbi.nlm.nih.gov/42180291/ *** Disclaimer: This article is for educational and informational purposes only. It is not intended to substitute for professional veterinary advice, diagnosis, treatment, or regulatory guidance. Always consult a licensed veterinarian or qualified specialist regarding animal health, disease diagnosis, and therapeutic decisions.