Occurrence of Toxoplasma gondii antibodies in lowland tapirs maintained ex situ in Brazil and Paraguay/Ocorrencia de anticorpos para Toxoplasma gondii em antas brasileiras mantidas ex situ no Brasil e no Paraguai.
Tapirus terrestris, known as Brazilian tapir or lowland tapir, is the second largest South American land mammal (EISENBERG & REDFORD, 1999) and has the widest distribution. T. terrestris is exclusively herbivorous, and is listed as vulnerable to extinction, according to the International Union for Conservation of Nature (FURTADO et al., 2010; NAVEDA et al., 2011).
High prevalence of anti-T. gondii antibodies have been detected in zoo animals around the world (SILVA et al, 2001; DE CAMPS et al 2008). Although few data on the infection by the parasite in tapirs is available, the modified agglutinating test (MAT) has already been used to identify antibodies in captive and free-living individuals of this species (NAVEDA et al., 2011). In this study the presence of T. gondii antibodies was determined in T. terrestris kept ex situ in institutions located in Brazil and Paraguay.
Between November 2010 and December 2012, T. terrestris from 10 Brazilian and one Paraguayan institution had blood samples collected. In total, samples were obtained from 47 tapirs (18 adult females, one sub-adult female, one juvenile female, 19 adult males, three sub-adult males and five juvenile males). Individuals were separated in juvenile (6 months to 1 year), sub-adult (1-4 years), and adult (over 4 years of age) according known age or estimations via tooth wear and appearance of foot cushions and corporal measurements (MEDICI, 2010) One animal had blood samples collected on two occasions (November 2010 and October 2011).Eight institutions were located in the southeastern region of Brazil (Sao Paulo, Minas Gerais and Espirito Santo States) and two in the southern region of Brazil (Parana State). The Paraguayan institution is located in the Alto Parana region.
Blood samples (10-50mL) were collected using puncture of a saphenous or cephalic vein or in their carpal/tarsal derived, in the medial access. Serum was separated by centrifugation and kept at -20[degrees]C until analysis.
Sera were processed using MAT at cut-off 1:25 and those positive were diluted base two, until the final titer. Positive and negative controls, previously known, were adopted (FURTADO et al., 2010; MINERVINO et al., 2010).The association between gender, age and the presence of T. gondii antibodies was analyzed using the chi-square test with Yates correction, and P<0.05 were considered significant. To assess the relation of age on the presence or absence of T. gondii antibodies, was applied a logistic regression on the data after transforming them in zeros and ones. For statistical purposes, the animal that had blood samples collected in two occasions, just the second collection was taken into consideration. All the analyses were performed on the R software version 3.3.1 (R CORE TEAM, 2016).
Antibodies against T. gondii (MAT [greater than or equal to] 25) were reported in 74.5% (35/47) tapirs (Table1).The highest titer was 800, reported in three animals. Antibodies were detected in 75% of females (15/20) and 74.1% of males (20/27). No correlation was observed between gender and presence of T. gondii antibodies. Concerning age, 30 out of 37 adults (81.1%), two out of the four sub-adults (50%) and three out of the six juveniles animals (50%) showed titer [greater than or equal to] 25. No relationship between age on presence or absence of T. gondii antibodies was reported (P=0.152). This reinforces the hypothesis that the simple exposure of animals to oocysts is a determinant factor of this contamination. T. gondii positive animals were reported in all assessed institutions. The animal that was assessed in two occasions was negative in the first collection (November 2010) and had a titer of 50 in the second (October 2011), indicating that infection occurred between collections.
Although the presence of antibodies against T. gondii had already been reported in tapirs (ZHANG et al., 2000; FURTADO et al., 2010; MINERVINO et al., 2010) this is the first study with a large sampling space and involving animals from different locations. The transmission of T. gondii in zoos is extremely important, because resistant and highly sensitive species to T. gondii, to which the disease can be fatal, are living in the same environment (DE CAMPS et. al., 2008). All 47 assessed tapirs were reported in good health conditions on clinical examination, even the three animals that had the highest titer (800), suggesting that in this species the infection probably occurs asymptomatically, as observed in most affected species (DUBEY & JONES, 2008).
Two female tapirs, with titers of 100 and 50, had given birth to healthy pups one and three months before tested, respectively. However, two other females, with titers of 25 and 800, had a recent miscarriage history. Although T. gondii is associated with congenital infection and abortion (DUBEY & JONES, 2008), there are no studies associating reproductive losses to T. gondii infection in this animal species.The MAT employed here detected IgG antibodies and seropositivity indicated exposure to the parasite. Although MAT has not been validated in tapirs, a MAT titer of 1:25 is considered as one of the most sensitive and specific tests for toxoplasmosis in animals (DUBEY & JONES, 2008).
Similar occurrence values were detected in females (75%) and male (74.1%) animals, comparable to observations also made in other studies with wild animals, what indicated that animals of both sexes are equally exposed to T. gondii. (SILVA et al., 2001; CARME et al., 2002; MINERVINO et al., 2010).
Nineteen out of 35 (54.3%) positive animals were born at the institution where the collection was performed, confirming that the infection occurred in this environment. It could reflect an error in the institutional management, facilitating the contact with oocysts by the environment, food, or water (ANDRE et al., 2010). It was not possible to determine the sources of infection but the high exposure in tapirs is probably associated with the ingestion of oocysts present in the feed, water or pasture provided, since tapirs are strict herbivores and diet in captivity is usually based on horse feed, forage, grains, fruits and vegetables (CLAUSS et al., 2009). Most of these foods provided and pasture can easily be contaminated by feral cat feces or by mechanical transportation of oocysts shed by captive wild felids and passed through keeper's clothing, boots, cleaning equipment or by transport hosts as birds and insects (ANDRE et al., 2010). So it is very important acquire and store feed carefully, as control the existence of feral cats in the zoo vicinities, preventing food and environmental contaminations (DE CAMPS et al., 2008). T. gondii oocysts are highly resistant, and to the routine, there is no easy and convenient method to kill them on fruits and vegetables, other than cooking until the temperature reaches 60oC (DE CAMPS et al., 2008).
The authors would like to thank the Foundation for Research Support of the Espirito Santo (FAPES--Processes 50239368 and 54684137), and the staff of all the sampled Institutions for their support during collection. We also thank Drs. A. Marcili, L. F. Tobias, P. R. Mangini, R. C. Santos, and E. R. Monteiro for their support in the development of this research.
BIOETHICS AND BIOSSECURITY COMMITTEE APPROVAL
All procedures were performed under the license number 34372-1, from the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA) and the approval number 175-2011 from the Committee of Ethics in the Use of Animals of Universidade de Vila Velha (CEUA-UVV)
Returned by the author 12.06.16 CR-2016-0712.R1
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Maria Fernanda Naegeli Gondim (1) Igor da Cunha Lima Acosta (2) Maria Cristina Valdetaro Rangel (1) Herbert Sousa Soares (2) Solange Maria Gennari (2) Jitender Prakash Dubey (3) Zalmir Silvino Cubas (4) Wanderlei de Moraes (4) Francisco Javier Sosa Chaparro (5) Francisco Candido Cardoso Barreto (6) Joao Luiz Rossi Junior (1)
(1) Departamento de Medicina Veterinaria, Universidade de Vila Velha (UVV), 29102-606, Vila Velha, ES, Brasil. E- mail: firstname.lastname@example.org. * Corresponding author.
(2) Departamento de Medicina Veterinaria Preventiva e Saude Animal, Faculdade de Medicina Veterinaria, Universidade de Sao Paulo (USP), Sao Paulo, SP, Brasil.
(3) United States Department of Agriculture, Agricultural Research Service, Beltsville Agriculture Research Center, Animal Parasitic Diseases Laboratory, Beltsville, MD, USA.
(4) Refugio Biologico Bela Vista, Itaipu Binacional, Foz do Iguacu, PR, Brasil.
(5) Centro de Investigacion de Animales Silvestres (CIASI), Itaipu Binacional, Hernandarias, Alto Parana, Paraguay.
(6) Laboratorio de Ecologia Quantitativa, Departamento de Ciencias Biologicas, Universidade Federal do Espirito Santo (UFES), Vitoria, ES, Brasil.
Table 1--Institutions, location and number of Tapirus terrestris sampled and positive to the presence of antibodies to T. gondii. Institution Location City/State N. positive/ N. examined (%) 1 Campinas/SP 1/2 (50.0) 2 Sorocaba/SP 2/6 (33.3) 3 Bauru/SP 1/1 (100.0) 4 Sao Bernardo do Campo/SP 2/2 (100.0) 5 Tapirai/SP 2/2 (100.0) 6 Marechal Floriano/ES 2/4 (50.0) 7 Cachoeiro do Itapemirim/ES 2/2 (100.0) 8 Pocos de Caldas/MG 1/1 (100.0) 9 Foz do Iguacu/PR 2/2 (100.0) 10 Foz do Iguacu/PR 4/6 (66.7) 11 Hernandarias/AP 16/19 (84.2) Total 35/47 (74.5)
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|Author:||Gondim, Maria Fernanda Naegeli; Acosta, Igor da Cunha Lima; Rangel, Maria Cristina Valdetaro; Soares|
|Date:||Mar 1, 2017|
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