Neospora caninum e toxoplasma gondii: revisão de literatura / Neospora caninum and toxoplasma gondii: review of literature / Neospora caninum y toxoplasma gondii: revisión de literatura

A Neospora caninum e a Toxoplasma gondii são os agentes etiológicos que causam a Neosporose e a Toxoplasmose, respectivamente. Estas duas doenças são consideradas de grande importância econômica e de distribuição mundial, que acometem tanto animais de produção quanto animais domésticos. Apresentam sinais clínicos inespecíficos, sendo a Neosporose frequentemente associada ao abortamento em fêmeas. Ambas enfermidades costumavam ser confundidas, dificultando o diagnóstico. São causadas por protozoários cosmopolitas de ciclos biológicos heteróxenos. O Toxoplasma gondii é responsável por doença clínica em cães e gatos, enquanto o Neospora caninum acomete somente cães. Além disso, não há, até o momento, relatos de Neosporose em humanos, diferente da Toxoplasmose. Ocasionalmente esta pode ocorrer em coiotes, suínos, ovinos, caprinos, equinos, cervídeos e bubalinos. Anticorpos contra Neospora tem sido descrito em raposas, camelos e felídeos. O objetivo da presente revisão, é elucidar a forma de transmissão, sinais clínicos, diagnóstico, tratamento e controle de ambas as doenças, mostrando suas semelhanças, afim de que se possa diagnosticá-las corretamente.(AU)

Neospora caninum and toxoplasma gondii are agents of great economic importance and worldwide distribution that affect production and domestic animals. They present nonspecific clinical signs, and neosporosis is a disease that frequently causes abortion in females, which is considered current, because both used to be confused, making diagnosis difficult. They are protozoan, cosmopolitan, of heterogeneous biological cycles. Toxoplasma gondii is responsible for clinical disease in dogs and cats, while Neospora caninum affects only dogs. Furthermore, there are no reports to date of neosporosis in humans, other than toxoplasmosis. Occasionally it may occur in coyotes, pigs, sheep, goats, horses, deer, and bubaline. Antibodies to Neospora have been described in foxes, camels, and felids. This review aims to elucidate the transmission, clinical signs, diagnosis, treatment, and control of both diseases, showing their similarities, so that they can be correctly diagnosed.(AU)

Neospora caninum y Toxoplasma gondii son los agentes etiológicos que causan Neosporosis y Toxoplasmosis, respectivamente. Estas dos enfermedades se consideran de gran importancia económica y de distribución mundial, afectando tanto al ganado como a los animales domésticos. Presentan signos clínicos inespecíficos y la neosporosis se asocia con frecuencia al aborto en mujeres. Ambas dolencias solían ser erróneas, lo que hacía difícil el diagnóstico. Son causados por protozoos cosmopolitas de ciclos biológicos heterogéneos. Toxoplasma gondii es responsable de enfermedades clínicas en perros y gatos, mientras que Neospora caninum sólo ataca a perros. Además, no se han notificado casos de Neosporosis en humanos hasta el momento, diferente de Toxoplasmosis. Ocasionalmente esto puede ocurrir en coyotes, cerdos, ovejas, cabras, caballos, ciervos y bubalinos. Se han notificado anticuerpos contra la Neospora en zorros, camellos y felinos. El propósito de esta revisión es dilucidar la forma de transmisión, los signos clínicos, el diagnóstico, el tratamiento y el control de ambas enfermedades, mostrando sus similitudes, de manera que puedan ser diagnosticadas correctamente.(AU)

Lack of serological and molecular evidences of Zika virus circulation in non-human primates in three states from Brazil

BACKGROUND Zika virus (ZIKV) was discovered in 1947 with the virus isolation from Rhesus monkey (Macaca mulatta) in Uganda forest, Africa. Old World Primates are involved in a sylvatic cycle of maintenance of this arbovirus, however a limited knowledge about the role of New World primates in ZIKV transmission cycles has been established. OBJECTIVE This work aimed to investigate the presence of enzootic circulation of ZIKV in New World Primates from three Brazilian states: São Paulo, Paraíba, and Paraná. METHODS We analyzed 100 non-human primate samples collected in 2018 and 2020 from free-ranging and captive environments from São Paulo (six municipalities belonging to Sorocaba region), Paraíba (João Pessoa municipality), and Paraná (Foz do Iguaçu municipality) using reverse transcriptase quantitative polymerase reaction (RT-qPCR) assays, indirect enzyme-linked immunosorbent assay (ELISA), and plaque reduction neutralization test (PRNT). FINDINGS All samples (n = 141) tested negative for the presence of ZIKV genome from tissue and blood samples. In addition, all sera (n = 58) from Foz do Iguaçu' non-human primates (NHPs) were negative in serological assays. MAIN CONCLUSION No evidence of ZIKV circulation (molecular and serological) was found in neotropical primates. In addition, the absence of antibodies against ZIKV suggests the absence of previous viral exposure of NHPs from Foz do Iguaçu-PR.

Improvement of a RT-PCR assay for Yellow Fever virus genome detection

The aim of the present study was to describe an improved protocol of reverse transcription polymerase chain reaction (RT-PCR) for Yellow Fever virus genome detection. A strain of ribonucleic acid of Yellow Fever virus was submitted to the improved protocol of RT-PCR and the amplicons were visualized under ultraviolet transilluminator, purifed and sequenced. The nucleotide sequence obtained was compared with sequences available in GenBank using the tblastx tool. The amplicons produced by the strain of ribonucleic acid of Yellow Fever virus exhibited fragments of 400 and 800 base pairs and the consensus sequence exhibited a similarity of 100% with Yellow Fever virus sequences recorded in GenBank. The improved protocol described in this study allowed Yellow Fever virus genome detection and enabled the elimination of the nested-PCR step, which has been frequently associated with contamination. In addition, it reduced the time of reaction, the cost of reagents and the possibility of sample contamination. New methods of investigating these infections must be elaborated and a continuous vigilance of these viruses in their different vectors and hosts is required to avoid negative impacts on human health, tourism and trade.(AU)

SEROLOGICAL DETECTION OF HEPATITIS A VIRUS IN FREE-RANGING NEOTROPICAL PRIMATES (Sapajus spp., Alouatta caraya) FROM THE PARANÁ RIVER BASIN, BRAZIL

Nonhuman primates are considered as the natural hosts of Hepatitis A virus (HAV), as well as other pathogens, and can serve as natural sentinels to investigate epizootics and endemic diseases that are of public health importance. During this study, blood samples were collected from 112 Neotropical primates (NTPs) (Sapajus nigritus and S. cay, n = 75; Alouatta caraya, n = 37) trap-captured at the Paraná River basin, Brazil, located between the States of Paraná and Mato Grosso do Sul. Anti-HAV IgG antibodies were detected in 4.5% (5/112) of NTPs, specifically in 6.7% (5/75) of Sapajus spp. and 0% (0/37) of A. caraya. In addition, all samples were negative for the presence of IgM anti-HAV antibodies. These results suggest that free-ranging NTPs were exposed to HAV within the geographical regions evaluated.

Evaluation of arboviruses of public health interest in free-living non-human primates (Alouatta spp., Callithrix spp., Sapajus spp.) in Brazil

INTRODUCTION: The aim of the present study was to evaluate the presence of arboviruses from the Flavivirus genus in asymptomatic free-living non-human primates (NHPs) living in close contact with humans and vectors in the States of Paraná and Mato Grosso do Sul, Brazil. METHODS: NHP sera samples (total n = 80, Alouatta spp. n = 07, Callithrix spp. n = 29 and Sapajus spp. n = 44) were screened for the presence of viral genomes using reverse transcription polymerase chain reaction and 10% polyacrylamide gel electrophoresis techniques. RESULTS: All of the samples were negative for the Flavivirus genome following the 10% polyacrylamide gel electrophoresis analysis. CONCLUSIONS: These negative results indicate that the analyzed animals were not infected with arboviruses from the Flavivirus genus and did not represent a risk for viral transmission through vectors during the period in which the samples were collected. .

Serological evidence for Saint Louis encephalitis virus in free-ranging New World monkeys and horses within the upper Paraná River basin region, Southern Brazil

Introduction Saint Louis encephalitis virus (SLEV) primarily occurs in the Americas and produces disease predominantly in humans. This study investigated the serological presence of SLEV in nonhuman primates and horses from southern Brazil. Methods From June 2004 to December 2005, sera from 133 monkeys (Alouatta caraya, n=43; Sapajus nigritus, n=64; Sapajus cay, n=26) trap-captured at the Paraná River basin region and 23 blood samples from farm horses were obtained and used for the serological detection of a panel of 19 arboviruses. All samples were analyzed in a hemagglutination inhibition (HI) assay; positive monkey samples were confirmed in a mouse neutralization test (MNT). Additionally, all blood samples were inoculated into C6/36 cell culture for viral isolation. Results Positive seroreactivity was only observed for SLEV. A prevalence of SLEV antibodies in sera was detected in Alouatta caraya (11.6%; 5/43), Sapajus nigritus (12.5%; 8/64), and S. cay (30.8%; 8/26) monkeys with the HI assay. Of the monkeys, 2.3% (1/42) of A. caraya, 6.3% 94/64) of S. nigritus, and 15.4% (4/26) of S. cay were positive for SLEV in the MNT. Additionally, SLEV antibodies were detected by HI in 39.1% (9/23) of the horses evaluated in this study. Arboviruses were not isolated from any blood sample. Conclusions These results confirmed the presence of SLEV in nonhuman primates and horses from southern Brazil. These findings most likely represent the first detection of this virus in nonhuman primates beyond the Amazon region. The detection of SLEV in animals within a geographical region distant from the Amazon basin suggests that there may be widespread and undiagnosed dissemination of this disease in Brazil. .

Perfil epidemiológico de casos de surtos de doenças transmitidas poralimentos ocorridos no Paraná, Brasil / Epidemiological profile of foodborne diseases outbreaks occurred in Parana state, Brazil

A investigação dos surtos de Doenças Transmitidas por Alimentos (DTA) é desafiadora. Para a Vigilância em Saúde é fundamental a identificação de grupos e fatores de risco associados às DTA. O objetivo deste trabalho foi caracterizar o perfil epidemiológico dos surtos de DTA ocorridos nos 29 municípiosque compõe a 2ª Regional de Saúde, da Secretaria Estadual de Saúde do Paraná, Brasil, entre 2005-2008. Tabularam-se 472 laudos de alimentos do Laboratório Central do Estado do Paraná (LACEN-PR) e fichas notificadas no Sistema de Informação de Agravos de Notificação (SINAN) de casos suspeitos de DTA. O grupo mais acometido foi de indivíduos do sexo feminino com 50,51% dos casos. Indivíduos entre 20 a 49 anos de idade foram os mais frequentemente envolvidos com 49,50% das ocorrências. Restaurantes (27,65%) e residências dos indivíduos acometidos (36,17%) foram os locais de preparo econsumo mais frequentemente envolvidos. Manipulação/preparo inadequados dos alimentos (36,95%) eforma de consumo inadequada (23,90%) foram os fatores causais mais predominantes. A maior parte dasconfirmações dos surtos fundamentou-se em achados clínico-epidemiológicos (44,68%). Com relaçãoaos micro-organismos identificados nas amostras analisadas, os resultados apontaram predominância Escherichia coli (indicador sanitário), seguido pelo Bacillus cereus e Staphyloccus aureus. Os alimentos mais frequentemente envolvidos foram o leite (29,68%) e as frutas, verduras e legumes (24,21%). Com a pesquisa é possível orientar medidas preventivas e de controle de DTA na população pesquisada.

The investigation of outbreaks of Food Borne Diseases (FBD) is challenging. For the Health Surveillance is essential to identify groups and risk factors associated with the DTA. The aim of this study was to characterize the epidemiology of outbreaks of DTA occurred in 29 counties that comprise the 2nd Regional Health, the Department of Health of Paraná, Brazil, from 2005-2008. Tabulated to 472 reports of food the Central Laboratory of the State of Paraná (LACEN-PR) chips and notified the Information System for Notifiable Diseases (SINAN) of suspected cases of DTA. The group most affected were females with 50.51% of the cases. Individuals between 20 and 49 years of age were most often involved in 49.50% of cases. Restaurants (27.65%) of affected individuals and households (36.17%) were the preparation and consumption sites most frequently involved. Manipulation / inadequate preparation of food (36.95%) and inadequate form of consumption (23.90%) were the most prevalent causative factors.Most confirmations of outbreaks was based on clinical and epidemiological (44.68%). With respect to micro-organisms identified in the samples analyzed, the results showed predominance Escherichia coli(health indicator), followed by Bacillus cereus and Staphylococcus aureus. The foods most frequently involved were milk (29.68%) and fruits and vegetables (24.21%). With this study can guide preventive measures and control of DTA in the population studied.

Nova técnica para descorna em bovinos / New dehorning method in cattle / El nuevo método para descorne en bovinos

A descorna cirúrgica em bovinos adultos pode resultar em uma série de complicações trans e pós-operatórias. A deiscência é mais comum, principalmente por tensão exagerada na linha de sutura quando não há pele suficiente para aproximação das bordas. O objetivo deste trabalho foi comparar duas técnicas de descorna cirúrgica e propor um método alternativo para redução de tensão na linha de sutura. Foram utilizados 20 bovinos mestiços (Bos taurus/Bos indicus), sendo que em dez, foi utilizada a técnica de descorna rotineira no corno direito e no esquerdo a técnica proposta. Nos demais, foi realizada, no corno direito a técnica proposta e no esquerdo a técnica rotineira. A técnica rotineira constou de ressecção de uma elipse de pele sobre a base do corno, divulsão tecidual, amputação do corno com fio serra e dermorrafia com fio poliamida 0,80 em padrão de sutura interrompida simples. A técnica cirúrgica proposta consistiu de uma incisão retilínea iniciada próximo à eminência nucal até a base medial do corno, completada com uma incisão curva formando uma meia elipse em direção latero-rostral. Na base lateral do corno foi excisada outra meia elipse posicionada latero-caudalmente. Após a amputação do corno com fio serra, realizou-se a dermorrafia como na técnica rotineira. A técnica proposta reduziu o tempo de cirurgia, possibilitando menor divulsão tecidual, com adequada aproximação das bordas da ferida e menor tensão na linha da sutura.