High occurrence of anti-Toxoplasma gondii and anti-Neospora caninum antibodies in dogs from the microregion of Pajeú, Sertão of the state of Pernambuco Samuel Souza Silva, Renato Amorim da Silva, Jéssica de Castro Souza Carvalho, Pollyanne Rayssa Fernandes de Oliveira, Renata Pimentel Bandeira de Melo, et al. Journal of Parasitic Diseases, 2026 The study aimed to determine the seroprevalence and risk factors associated with Toxoplasma gondii and Neospora caninum infections among dogs from the microregion of Pajeú, Sertão, state of Pernambuco. Blood samples (n = 247) of dogs apparently healthy were collected through puncture of cephalic vein and serum evaluated using the Immunofluorescence Antibody Test (IFAT). Risk factors were calculated using univariate analysis and logistic regression. We determined the spatial distribution of seroreactive animals through maps created using the QGIS software. The overall seroprevalence was 61.54% (152/247) and 64.78% (160/247) for T. gondii and N. caninum , respectively. Of the animals tested, 40.89% (101/247) were seroreactive for both protozoa. The presence of ectoparasites (ticks and fleas) (OR = 0.53; 0.2850–0.9931) and hunting behavior (OR = 0.45; 0.2115–0.9415) were considered risk factors for anti- N. caninum antibodies. Age ≥ 5 and < 10 years old (OR = 1.94; 1.0301–3.6655) and crossbreed (OR = 2.35; 1.0935–5.0652) were risk factors for seropositivity for both pathogens. Seroreactive animals were distributed heterogeneously across the microregion of Pajeú. The high occurrence of anti- T. gondii and anti- N. caninum antibodies in the dog population indicate previous exposure to these pathogens. Therefore, preventive measures should be promoted to mitigate the risk of animal and human infection.
In vitro biological activity of hydroalcoholic extracts from Caesalpinia ferrea and Lippia origanoides on adults of Bovicola caprae (Gurlt, 1843) (Mallophaga: Trichodectidae) T.A.S. Andrade, E.H.A. Silva, T.R.M. Silva, L.O. Macedo, E.T.N. Farias, et al. Arquivo Brasileiro De Medicina Veterinaria E Zootecnia, 2026 The conventional control of Bovicola caprae consists of using chemical insecticides, which often becomes ineffective due to the development of resistance, stimulating the search for alternative control methods. This study evaluated the in vitro bioinsecticidal potential of hydroalcoholic extracts from Caesalpinia ferrea and Lippia origanoides against adult B. caprae. The extracts of C. ferrea and L. origanoides were obtained from the fruits and leaves, respectively. Specimens of B. caprae (80 per group) were exposed to five different concentrations of each extract. The tests were conducted in duplicate, using distilled water (negative control) and deltamethrin (positive control) as control groups. Mortality was assessed at 2h, 4h, 6h, 12h, 24h, and 48h after exposure to the products. Both extracts caused mortality in the lice. Total mortality was observed after 6h of exposure to L. origanoides extract at 130 mg/mL. C. ferrea presented an LC50 of 67.82mg/mL up to 4h and caused total mortality at a concentration of 78.75 mg/mL from 12h after exposure to the hydroalcoholic extracts. Due to the insecticidal activity observed, both extracts are considered promising for the control of this ectoparasite.
Filarial Nematodes in Dogs from the Northeast Region of Brazil Daniely Oliveira do Nascimento Rocha, Lucia Oliveira Macedo, Jéssica Cardoso Pessoa de Oliveira, Samuel Souza Silva, Herbert Patric Kellermann Cleveland, et al. Acta Parasitologica, 2024
Feline sporotrichosis: occurrence in the Metropolitan Region of the municipality of Recife and anatomical distribution of lesions on cats’ body Edson Moura da Silva, Luiz Felipe de Araújo França, Jéssica Cardoso Pessoa de Oliveira, Gílcia Aparecida de Carvalho, Daniel Dantas Moreira Gomes, et al. Medicina Veterinaria Brazil, 2024 Sporotrichosis is a fungal infection of worldwide importance caused by a saprophyte fungus of the genus Sporothrix. The objective of this study was to report the occurrence of feline sporotrichosis in the Metropolitan Region of the city of Recife and the anatomical distribution of lesions on the bodies of cats. Stray cats (n=100) with suggestive sporotrichosis lesions were examined. Material from the lesion was collected from all patients using an imprint and/or sterile swab for cytology. The material was placed on a glass slide and stained using rapid panoptic staining. Data on the localization of each skin lesion were recorded, and cigar-shaped yeast structures were searched at the microscopical examination. A heat map graphically represented the anatomical distribution of each lesion. In 70% (70/100) of samples were visualized fungal structure compatible with Sporothrix spp. There was a predominance of positive males (?2=6.691; p=0.0097). Skin lesions related to Sporothrix spp. infections were unevenly distributed throughout the animal's body. Based on the interpolation of data, the chance for detecting lesions was higher on the nose, anterior paw, and ears than on other body sites (H=40.0043; p=0.0000). Because of the high positivity in these cats, measures of health vigilance are imperative to reduce the risk of animal and human infection.
Evaluation of the performance of synthetic acaricides and the essential oil of Plectranthus amboinicus (Lour.) Spreng (Lamiaceae) for the control of Rhipicephalus (Boophilus) microplus E.H.A. Silva, R.S. Brito, A.J. Santos, E.B. Silva Junior, I.V.M. Siqueira, et al. Arquivo Brasileiro De Medicina Veterinaria E Zootecnia, 2024 Chemical acaricides are used as the primary method for controlling Rhipicephalus (Boophilus) microplus. However, the incorrect use of these compounds over the years has led to the emergence of resistant tick populations. This study aimed to evaluate the effectiveness of different combinations of synthetic acaricides and the essential oil of Plectranthus amboinicus on engorged females of R. (B.) microplus. Engorged females were obtained from infested bovines in dairy farms in the Agreste mesoregion of Pernambuco, Brazil. Five different combinations of commercial synthetic acaricides: I) Chlorpyrifos 30.0g + Cypermethrin 15.0g + Fenthion 15.0g; II) Chlorpyrifos 8.5g + Cypermethrin 15.0g + Ethion 16.0g; III) Deltamethrin 50.0g; IV) Amitraz 12.5g; V) Chlorpyrifos 15.0g + Cypermethrin 25.0g + Piperonyl butoxide 50.0g, and the 1% essential oil of P. amboinicus were used for the Adult Immersion Test. Only the combinations I and V of synthetic acaricides and essential oil showed efficacy over 95%. The findings of this study demonstrate that ticks’ resistant populations are present in the study area, and the essential oil of P. amboinicus is a promising compound for developing products used for tick control. Finally, it is paramount to implement educational activities to improve farmers' awareness of the rational use of acaricides.
Filarioids infecting dogs in northeastern Brazil Rafael Antonio Nascimento Ramos, Ana Gabriela de Oliveira do Rêgo, Everton Diogo de Farias Firmino, Carlos Alberto do Nascimento Ramos, Gílcia Aparecida de Carvalho, et al. Veterinary Parasitology, 2016
Histological changes and immunolabeling of Leishmania infantum in kidneys and urinary bladder of dogs Revista Brasileira De Parasitologia Veterinaria, 2013
Search of natural occurrence of xiphidiocercariae (trematoda) in fresh water snails of nine countries from São Paulo State, Brazil Boletin Chileno De Parasitologia, 2001
In vitro biological activity of hydroalcoholic extracts from Caesalpinia ferrea and Lippia origanoides on adults of Bovicola caprae (Gurlt, 1843) (Mallophaga … TAS Andrade, EHA Silva, TRM Silva, LO Macedo, ETN Farias, ... Arquivo Brasileiro de Medicina Veterinária e Zootecnia 78 (2), e13588 , 2026 2026
Atividade biológica in vitro de extratos hidroalcoólicos de Caesalpinia ferrea e de Lippia origanoides sobre adultos de Bovicola caprae (Gurlt, 1843 … TAS Andrade, EHA Silva, TRM Silva, LO Macedo, ETN Farias, ... Arquivo Brasileiro de Medicina Veterinária e Zootecnia 78, e13588 , 2026 2026
A critical review of American Trypanosomiasis (AT) in dogs with the current distribution of cases in Brazil and a diagnostic approach for veterinary clinicians JA Oliveira Neto, GM Silva, SS Silva, TRM Silva, GA Carvalho, LC Alves Veterinary Research Communications 50, 1 - 14 , 2026 2026
Cysticercus bovis and hydatid cysts in cattle slaughtered in the Northeastern region of Brazil and associated risk factors ZBC de Souza, EHA Silva, ATN Torres, LA Dos Santos, IVM de Siqueira, ... Veterinary Parasitology: Regional Studies and Reports, 101374 , 2025 2025
Cysticercus bovis and hydatid cysts in cattle slaughtered in the Northeastern region of Brazil and associated risk factors ZBC Souza, EHA Silva, ATN Torres, LA Santos, IVM Siqueira, AMFF Leão Veterinary Parasitology: Regional Studies and Reports 66, 1 - 7 , 2025 2025
EDUCAÇÃO SANITÁRIA NA MICRORREGIÃO DE GARANHUNS: ABORDANDO A CRIPTOSPORIDIOSE EM PROPRIEDADES RURAIS E ESCOLAS LOCAIS EHA Silva, IVM de Siqueira, IHF Melo, A Santos, L Santos, Z Souza, ... Revista Sendas 2 (1) , 2024 2024
Evaluation of the performance of synthetic acaricides and the essential oil of Plectranthus amboinicus (Lour.) Spreng (Lamiaceae) for the control of Rhipicephalus (Boophilus … EHA Silva, RS Brito, AJ Santos, EB Silva Junior, IVM Siqueira, ... Arquivo Brasileiro de Medicina Veterinária e Zootecnia 76, e13160 , 2024 2024 Citations: 3
Triatomine vectors of Trypanosoma cruzi in an endemic area for Chagas disease in Northeast Brazil JA Oliveira, DB Anastácio, TRM Silva, SS Silva, GA Carvalho, ... Revista da Sociedade Brasileira de Medicina Tropical 57, e00700-2023 , 2024 2024 Citations: 1
Feline sporotrichosis: occurrence in the Metropolitan Region of the municipality of Recife and anatomical distribution of lesions on cats' body EM Silva, LFA França, JCP Oliveira, GA Carvalho, DDM Gomes, JW Pinheiro ... Medicina Veterinária UFRPE 18, 240 - 245 , 2024 2024
Cryptosporidium and Giardia species infections in sheep from Brazil and associated risk factors LA Santos, EHA Silva, IHF Melo, IVM Siqueira, GMPP Felix, ZBC Souza, OC ... Small Ruminant Research 240, 1 - 6 , 2024 2024 Citations: 1
Chemical Composition and Acaricidal Activity of Essential Oil of Lavandula dentata L. on Engorged Females of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) CMO Xavier, EHA Silva, IVM Siqueira, LO Macedo, VB Bernardo, HF Goulart, AEG ... Acta Parasitologica 69, 1141 - 1147 , 2024 2024 Citations: 4
Filarial Nematodes in Dogs from the Northeast Region of Brazil DON Rocha, LO Macedo, JCP Oliveira, SS Souza, HPK Cleveland Acta Parasitologica 69, 1115 - 1121 , 2024 2024 Citations: 3
Evaluation of larval development of Dirofilaria immitis in different populations of Aedes aegypti and Aedes albopictus. GAP CARVALHO, RT Maia, RAN Ramos, CFS ANDRADE, ... Universidade Federal de Campina Grande , 2024 2024 Citations: 5
An overview of anthelmintic resistance in domestic ruminants in Brazil LO Macedo, SS Silva, LC Alves, GA Carvalho, RAN Ramos Ruminants 3 (3), 214-232 , 2023 2023 Citations: 10
Leishmaniases in a tropical area of Brazil: a spatio‑temporal analysis CRC Ubirajara Filho, TARF Lima, LSS Barros, A Giannelli, LC Alves, GA ... Journal of Parasitic Diseases 47, 556 - 561 , 2023 2023 Citations: 1
The Role of Parasitoid Wasps, Ixodiphagus spp. (Hymenoptera: Encyrtidae), in Tick Control RAN Ramos, LO Macedo, MA Bezerra-Santos, GA Carvalho, GG Verocai, D Otranto Pathogens 12, 676, 1 - 11 , 2023 2023 Citations: 17
Neoctangium travassosi (Digenea: Microscaphidiidae) in sea turtles from South America CG Silva, TA Rocha, ACB Freire, JCP Oliveira, DSD Farias, FJL Silva, CIA ... Arq. Bras. Med. Vet. Zootec. 75, 199 - 204 , 2023 2023 Citations: 2
Molecular detection of vector-borne pathogens in cats tested for FIV and FeLV TB Melo, TRM Silva, TLAC Almeida, JF Tutija, AO Silva, MS Lira, D Amorim, A ... Veterinary Parasitology: Regional Studies and Reports 40, 1 - 5 , 2023 2023 Citations: 15
Canine visceral leishmaniasis: risk factors and spatial analysis in an endemic area of Northeastern Brazil SS Silva, LO Macedo, JCP Oliveira, LC Alves, GA Carvalho, RAN Ramos Revista Brasileira de Parasitologia Veterinária 32, e003223 , 2023 2023 Citations: 16
Larvoscopic study on Dictyocaulus sp. in the faeces of beef cattle in northeastern Brazil LO Macedo, CRC Ubirajara Filho, RS Brito, KKF Santos, CL Mendonça, ... Revista Brasileira de Parasitologia Veterinária 31 (3), e009122 , 2022 2022 Citations: 7
MOST CITED SCHOLAR PUBLICATIONS
Effects of essential oils on Aedes aegypti larvae: alternatives to environmentally safe insecticides WJ Silva, GAA Dória, RT Maia, RS Nunes, GA Carvalho, AF Blank, ... Bioresource technology 99 (8), 3251-3255 , 2008 2008 Citations: 308
A study of the larvicidal activity of two Croton species from northeastern Brazil against Aedes aegypti GAA Dória, WJ Silva, GA Carvalho, PB Alves, SCH Cavalcanti Pharmaceutical biology 48 (6), 615-620 , 2010 2010 Citations: 92
Prevalence of zoonotic visceral leishmaniasis in dogs in an endemic area of Brazil DS Pimentel, RAN Ramos, MA Santana, CS Maia, GA Carvalho, HP Silva, ... Revista da Sociedade Brasileira de Medicina Tropical 48 (4), 491-493 , 2015 2015 Citations: 37
Detection and molecular characterization of Trypanosoma ( Duttonella ) vivax in dairy cattle in the state of Sergipe, northeastern Brazil OLE Vieira, LO Macedo, MAB Santos, JABA Silva, CL Mendonça, ... Revista Brasileira de Parasitologia Veterinária 26, 516-520 , 2017 2017 Citations: 36
Quantification of Leishmania infantum DNA in the bone marrow, lymph node and spleen of dogs RAN Ramos, CAN Ramos, EMS Santos, FR Araújo, GA Carvalho, ... Revista Brasileira de Parasitologia Veterinária 22 (3), 346-350 , 2013 2013 Citations: 30
Detection of antibodies against Leishmania infantum in cats ( Felis catus ) from the State of Pernambuco, Brazil RCN Silva, RAN Ramos, DS Pimentel, GMA Oliveira, GA Carvalho, ... Revista da Sociedade Brasileira de Medicina Tropical 47 (1), 108-109 , 2014 2014 Citations: 27
Prevalence of infection by Cryptosporidium spp. in calves and associated risk factors in Northeastern Brazil AI Conceição, LPS Almeida, LO Macedo, CL Mendonça, LC Alves, ... Arquivo Brasileiro de Medicina Veterinária e Zootecnia 73 (01), 34-40 , 2021 2021 Citations: 19
The Role of Parasitoid Wasps, Ixodiphagus spp. (Hymenoptera: Encyrtidae), in Tick Control RAN Ramos, LO Macedo, MA Bezerra-Santos, GA Carvalho, GG Verocai, D Otranto Pathogens 12, 676, 1 - 11 , 2023 2023 Citations: 17
Vector competence of Culex quinquefasciatus Say, 1823 exposed to different densities of microfilariae of Dirofilaria immitis (Leidy, 1856) GA Carvalho, LC Alves, RT Maia, CFS Andrade, RAN Ramos, ... Revista Brasileira de Entomologia 52 (4), 658-662 , 2008 2008 Citations: 17
Canine visceral leishmaniasis: risk factors and spatial analysis in an endemic area of Northeastern Brazil SS Silva, LO Macedo, JCP Oliveira, LC Alves, GA Carvalho, RAN Ramos Revista Brasileira de Parasitologia Veterinária 32, e003223 , 2023 2023 Citations: 16
Biological control of Aedes albopictus (Diptera: Culicidae) larvae in trap tyres by Mesocyclops longisetus (Copepoda: Cyclopidae) in two field trials LU Santos, CFS Andrade, GA Carvalho Memórias do Instituto Oswaldo Cruz 91 (2), 161-162 , 1996 1996 Citations: 16
Molecular detection of vector-borne pathogens in cats tested for FIV and FeLV TB Melo, TRM Silva, TLAC Almeida, JF Tutija, AO Silva, MS Lira, D Amorim, A ... Veterinary Parasitology: Regional Studies and Reports 40, 1 - 5 , 2023 2023 Citations: 15
Gastrointestinal parasites in dogs and cats in line with the One Health'approach CRC Ubirajara Filho, KKF Santos, T Lima, LC Alves, GA Carvalho, ... Arquivo Brasileiro de Medicina Veterinária e Zootecnia 74 (01), 43-50 , 2022 2022 Citations: 15
Histological changes and immunolabeling of Leishmania infantum in kidneys and urinary bladder of dogs JP Santos, LC Alves, RAN Ramos, DS Pimentel, GA Carvalho, ... Revista Brasileira de Parasitologia Veterinária 22 (3), 420-423 , 2013 2013 Citations: 15
Lungworms in ruminants from Brazil: A retrospective epidemiological study over four decades LO Macedo, TARF Lima, GG Verocai, LC Alves, GA Carvalho, RAN Ramos Veterinary Parasitology: Regional Studies and Reports 26, 100645, 1 - 7 , 2021 2021 Citations: 14
Spatial distribution of Aedes aegypti (Diptera: Culicidae) in vulnerable areas for the transmission of arboviruses ENL Soares, MAB Santos, LO Macedo, CVB Santos, MCR Agra, LC Alves, ... Revista da Sociedade Brasileira de Medicina Tropical 52, e20180341 , 2019 2019 Citations: 14
Seroprevalence of Neospora caninum and Toxoplasma gondii in dogs from an urban area of North-eastern Brazil: a spatial approach IB Souza, PR Fernandes, TRM Silva, CVB Santos, NMM Silva, ... Revista da Sociedade Brasileira de Medicina Tropical 52, e20180440 , 2019 2019 Citations: 14
Seroprevalence and spatial distribution of canine leishmaniasis in an endemic region in Brazil: how has the situation changed after 10 years? TNB Lins, IB Souza, GMMR Barros, CVB Santos, RP Silva, LC Alves, ... Revista da Sociedade Brasileira de Medicina Tropical 51 (05), 680-682 , 2018 2018 Citations: 13
Phlebotomines in an area endemic for American cutaneous leishmaniasis in northeastern coast of Brazil APO Silva, DEO Miranda, MAB Santos, NR Guerra, SR Marques, ... Revista Brasileira de Parasitologia Veterinária 26, 280-284 , 2017 2017 Citations: 13
Sandflies (Diptera: Psychodidae) in an urban area of Northeastern Brazil MCR Agra, PL Costa, AES Duque, ENL Soares, LC Alves, RAN Ramos, ... Revista da Sociedade Brasileira de Medicina Tropical 49 (06), 698-702 , 2016 2016 Citations: 12
