Coccidiosis, also commonly referred to as bloody diarrhea, is caused by Eimeria spp. and primarily affects the digestive tract. The most pathogenic Eimeria species in chickens are Eimeria tenella and Eimeria necatrix. The subject of this case study was a 27-day-old female broiler chicken from a commercial farm located in Tunjuk Village, Marga Subdistrict, Tabanan Regency, Bali. The chicken had been reported to suffer from bloody diarrhea for five days, accompanied by clinical signs of weakness, anorexia, pale comb, ruffled feathers, and a tendency to huddle in the corner of the pen. This case study aimed to describe the anatomical pathology, histopathology, and laboratory findings to obtain a definitive diagnosis of the disease affecting this chicken. The results of the anatomical pathology examination showed hemorrhage in the cecum. Histopathological examination of the cecum revealed the presence of schizonts, hemorrhage, and inflammatory cell infiltration. Qualitative fecal examination confirmed the presence of Eimeria spp. oocysts, while quantitative fecal examination using the McMaster technique revealed 895,600 oocysts per gram of feces, indicating a severe infection. Based on clinical observations, epidemiological data, gross pathological changes, histopathological findings, and fecal examinations using native, sedimentation, flotation, and McMaster methods, it was concluded that the chicken was affected by coccidiosis.

Arsyithalia, N., Ardana, I. B. K., dan Apsari, I. A. P. (2019). Prevalensi infeksi Eimeria spp. pada ayam pedaging yang diberi pakan tanpa Antibiotic Growth Promoters (AGP) di Kabupaten Tabanan, Bali. Indonesia Medicus Veterinus, 8(2): 186–192.

Correia, S., Suratma, N. A., dan Oka, I. B. M. (2022). Prevalensi dan intensitas infeksi Eimeria spp. April–Mei 2021 pada ayam petelur lebih tinggi daripada ayam pedaging di Tembuku, Bangli, Bali. Indonesia Medicus Veterinus, 11(3): 343–349.

Deptan. (2012). Manual standar metoda diagnosa laboratorium kesehatan hewan. Jakarta: Direktorat Bina Kesehatan Hewan, Dirjen Peternakan, Deptan.

Djara, D. V. S., Ardana, I. B. K., dan Winaya, I. B. O. (2009). Perubahan patologik sekum ayam pedaging (Gallus gallus) yang terinfeksi koksidiosis di Kabupaten Tabanan, Bali. Indonesia Medicus Veterinus, 9(2): 187–196.

Ekawasti, F., dan Martindah, E. (2019). Pengendalian koksidiosis pada ayam melalui pengobatan herbal. Wartazoa, 29(1): 001–012.

Halidazia. (2015). Identifikasi protozoa endoparasit pada ayam negeri (Gallus gallus domestica) di peternakan Desa Sardonoharjo, Ngaglik, Sleman [Skripsi]. Yogyakarta: Fakultas Sains dan Teknologi, Universitas Negeri Sunan Kalijaga.

Iacob, O., dan Duma, V. (2009). Clinical, paraclinical and morphopathological aspects in cecal eimeriosis of broilers. Rev. Sci. Parasitol, 10: 43–50.

Iskandar, T. (2005). Pengaruh pemberian vitamin A terhadap nilai perlukaan sekum, waktu sporulasi, dan produksi ookista Eimeria tenella pada ayam Arab. Prosiding Seminar Nasional Teknologi Peternakan dan Veteriner 2005, Pusat Penelitian dan Pengembangan Peternakan, 12–19.

Levine, N. D. (1995). Protozologi veteriner. Yogyakarta: Gadjah Mada University Press.

Liao, S., Lin, X., Zhou, Q., Yan, Z., Wu, C., Li, J., Lv, M., Hu, J., Cai, H., Song, Y., Chen, X., Zhu, Y., Yin, L., Zhang, J., Qi, N., dan Sun, M. (2024). Prevalence, geographic distribution and risk factors of Eimeria species on commercial broiler farms in Guangdong, China. BMC Veterinary Research, 20(1): 1–17.

López-Osorio, S., Chaparro-Gutiérrez, J. J., dan Gómez-Osorio, L. M. (2020). Overview of Poultry Eimeria Life Cycle and Host-Parasite Interactions. Frontiers in Veterinary Science, 7(7): 1–8.

Muchibi, J. (2018). Prevention, control and management of coccidiosis in chicken. Daily Nation, 9 Mei 2018. https://nation.africa/kenya/business/seeds-of-gold/prevention-control-and-management-of-coccidiosis-in-chicken-41616

Nonkookhetkhong, T., dan Chalalai, T. (2021). Lesion Scores , Oocysts Output , Hematological and Histopathological Changes of the 7 Days Life Cycle of Eimeria Tenella in Broilers . Research Square, 21(2): 1–13.

Putong, M. A., Kalangi, J. K. J., Massie, M. T., dan Lumi, T. F. D. (2020). Pengaruh pendapatan rumah tangga terhadap konsumsi daging broiler di Kelurahan Kleak, Kecamatan Malalayang, Manado. Jurnal Ilmu Pendidikan, 40(1): 143–149.

Qomariyuti, R. S., Majid, R. A., Amany, N. R., Fajrin, R. F., Tyaagita, dan Viqih, M. (2023). Enteritis dan infeksi sekunder coccidiosis pada ayam broiler di Kota Tegal, Jawa Tengah. Buletin Veteriner Udayana, 15(5): 864–872.

Simamora, S., Apsari, I. A., dan Dwinata, I. M. (2017). Prevalensi Eimeria tenella pada ayam buras di wilayah Bukit Jimbaran, Badung. Indonesia Medicus Veterinus, 6(3): 254–261.

Tampubolon, M. P. (2004). Protozoologi. Bogor: Fakultas Kedokteran Hewan, Institut Pertanian Bogor.

Yulian, N. E. (2017). Studi infeksi koksidia pada ayam petelur (Gallus gallus) strain Lohman jantan di peternakan mandiri Kelurahan Segalamider, Kecamatan Tanjung Karang Barat, Kota Bandar Lampung [Skripsi]. Bandar Lampung: Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Lampung.