Morphological and epidemiological data on Eimeria species infecting small ruminants in Brazil

Macedo, Lucia Oliveira de; Bezerra‐Santos, Marcos Antônio; Silva, Naiara Mirelly Marinho da; Barros, Guilherme Mota Maciel do Rêgo; Alves, Lêucio Câmara; Giannelli, Alessio; Carvalho, Gílcia Aparecida de

doi:10.1016/j.smallrumres.2018.12.006

Cited by 24 publications

(25 citation statements)

References 17 publications

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“…In samples with less than 100 oocysts, all were analyzed. Species differentiation was based on morphometric and morphological characteristics, such as: shape, color, and presence or absence of micropyle and micropylar caps, following Souza et al (2015) and Macedo et al (2019). For descriptive analysis, the Excel ® 2019 software package was used.…”

Section: Methodsmentioning

confidence: 99%

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Eimeria spp. infection in lambs from southern Brazil

et al. 2020

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Eimeria infections are common in the sheep industry worldwide. Lambs are more susceptible to coccidiosis, especially in stressful conditions, being infected by different species of the parasite. Eimeria crandallis and Eimeria ovinoidalis are considered the most pathogenic, causing reduced growth, dehydration, anorexia, and death. In this study, the frequency of Eimeria species was evaluated in lambs from the southern region of the Rio Grande do Sul state, Brazil. Fecal samples from 248 lambs, from 19 farms, were tested for the presence of oocysts. The positive samples were re-examined and the sporulated oocysts analyzed morphometrically to identify the presence of Eimeria species. In 100% of the evaluated farms, there were animals positive for the protozoan. The frequency of Eimeria species was: E. ovinoidalis (94.74%), E. crandallis (89.47%), E. granulosa (78.95%), E. parva (68.42%), E. ahsata (63.13%), E. punctata (42.11%), E. bakuensis (36.84%), E. faurei (10.53%), and E. pallida (5.26%). Mixed infection was found in 94.74% of the samples. This research describes, for the first time, the occurrence of E. crandallis and E. ovinoidalis infecting lambs in the study area. The wide distribution of this protozoan and the high frequency of pathogenic species show the importance and potential damage of sheep coccidiosis in herds from Rio Grande do Sul.

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Section: Methodsmentioning

confidence: 99%

“…Currently, eleven Eimeria species are recognized as causing sheep infections, with E. crandallis and E. ovinoidalis being the most pathogenic (Andrews 2013). Species differentiation is still a challenge, requiring coprological examination with a precise morphometric analysis of sporulated oocysts (Macedo et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Eimeria spp. infection in lambs from southern Brazil

et al. 2020

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“…Quantification of Eimeria spp. oocysts was performed using a modified quantitative McMaster method ( Gordon and Whitlock, 1939 ), and differentiated based on available species descriptions ( Vercruysse, 1982 ; Rommel, 2000 ; de Macedo et al, 2019 ).…”

Section: Methodsmentioning

confidence: 99%

Impacts of dietary zinc concentrations on lamb feedlot performance1

Knuth

Cunningham-Hollinger

Bangoura

et al. 2020

Translational Animal Science

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“…Characterization and alignment of OTUs to global Eimeria isolates aid in the creation of genetic markers used to identify the genetic variants (Morgan and Godwin, 2017). However, to determine whether OTUs have recently diverged from closely related Eimeria species the prevalence, characterization and geographical distribution of these OTUs need to be accessed (de Macedo et al ., 2019).…”

Section: Eimeria Otus: Divergent Strains or Distinct Species?mentioning

confidence: 99%

“…The origin of OTUs is yet to be discovered due to a lack of historical samples. Therefore, additional studies should be carried out to determine the geographical origin of OTUs (Fornace et al, 2013;de Macedo et al 2019). However, OTUs could be distinct species of Eimeria, which diverged a long time ago, together with the seven known Eimeria species as opposed to diverging recently from closely related species.…”

Section: Factors Influencing the Polarized Distribution Of Eimeria Otusmentioning

confidence: 99%

Emerging threat ofEimeriaoperational taxonomic units (OTUs) on poultry production

Venkatas

Adeleke

2019

Parasitology

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Coccidiosis is an antagonistic poultry disease which negatively impacts animal welfare and productivity. The disease is caused by an obligate, intracellular protozoon known as Eimeria. Several Eimeria species known to infect chickens have been well documented. However, recent studies have elucidated the emergence of three novel genetic variants or operational taxonomic units (OTUs). The discovery of OTUx, OTUy and OTUz complicates the identification and diagnosis of coccidiosis. OTUs are clusters of unknown or uncultivated organisms that are grouped according to a similarity in DNA sequence to a set of specific gene markers. OTUs have been reported in the Earth's Southern Hemisphere, including Australia, Venezuela, India, Zambia, Uganda, Tanzania, China and Ghana. Elucidating their impact on the poultry industry is fundamental in preventing anticoccidial resistance and to access the potential of OTUs as vaccine candidates to provide cross-protection against similar Eimeria species. The identification of OTUs further decreases the risk of false negative coccidial diagnosis. Therefore, this article reviews the importance and risk imposed by OTUs, coupled with their prevalence and geographical distribution in chickens globally.

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Morphological and epidemiological data on Eimeria species infecting small ruminants in Brazil

Cited by 24 publications

References 17 publications

Eimeria spp. infection in lambs from southern Brazil

Eimeria spp. infection in lambs from southern Brazil

Impacts of dietary zinc concentrations on lamb feedlot performance1

Emerging threat ofEimeriaoperational taxonomic units (OTUs) on poultry production

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