Characteristics of Triatomine infestation and natural Trypanosoma cruzi infection in the State of Rio Grande do Norte, Brazil

INTRODUCTION: A seroepidemiological survey was carried out to evaluate Trypanosoma cruzi infection in an endemic area of the State of Rio Grande do Norte, Brazil, involving rural residents. METHODS: Sixteen municipalities were randomly selected, 15 from the west mesoregion and one from the central, with an estimated population of 83,852 individuals. A total of 1,950 blood samples were collected in the west mesoregion and 390 in Caicó. Anti-T. cruzi antibodies were detected using the Chagatest® ELISA HAI-hemagglutination kits and indirect immunofluorescence. As sera presented indeterminate results, TESAcruzi® western blot was performed to confirm reactivity. RESULTS: An estimated seroprevalence of 6.5% was determined for the west mesoregion and 3.3% for Caicó. Seropositivity rises progressively with the age of individuals, up to 40 years in Caicó and up to 50 years in the west mesoregion. Only educational level and knowledge regarding the triatomine were associated with seropositivity. No seroreactive individuals under 18 years of age were identified. CONCLUSIONS: Infection by T. cruzi remains high and is concentrated in municipalities in the central western area of the west mesoregion; however, evidence suggests a decline in vector transmission in this mesoregion and in Caicó. Epidemiological variables appear not to influence seropositivity, with the exception of education and knowledge concerning the triatomine, among seroreactive individuals from the west mesoregion.

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Investigation regarding the presence of Trypanosoma cruzi in triatomines and humans in rural households in the State of Paraná, southern Brazil

Research Society and Development ◽

10.33448/rsd-v10i10.18366 ◽

2021 ◽

Vol 10 (10) ◽

pp. e54101018366

Author(s):

Ana Paula de Abreu ◽

Hevillyn Fernanda Lucas da Silva ◽

Marcella Paula Mansano Sarto ◽

Giullia Ferreira Iunklaus ◽

João Vitor Trovo ◽

...

Keyword(s):

Trypanosoma Cruzi ◽

Rural Households ◽

Etiologic Agent ◽

The State ◽

Molecular Techniques ◽

Triatoma Infestans ◽

Southern Brazil ◽

The North ◽

Intestinal Contents ◽

Cruzi Infection

Trypanosoma cruzi, the etiologic agent of Chagas disease (CD), is transmitted by hematophagous insects belonging to the subfamily Triatominae. After elimination of Triatoma infestans, the infestation of human dwellings by secondary species of vectors continues to pose a risk of transmission of the parasite. Our aim was to investigate the T. cruzi presence in triatomines and humans in rural households in the State of Paraná, southern Brazil. The capture of the insects was carried out by technicians of the municipalities after residents reported the outbreak. Five residents and 27 triatomines captured in four municipalities in the North and Midwest of the state were evaluated. The research of T. cruzi was carried out using parasitological, serological, and molecular techniques, in human blood, excreta, intestinal contents and insect macerate. Panstrongylus megistus, P. geniculatus and Triatoma sp. were identified. Ten specimens of P. megistus were captured in a house in Mandaguari with five residents and presented an infection rate of 70% for T. cruzi like. All residents tested negative for T. cruzi infection. Another 15 P. megistus were captured in the peridomicile in Janiópolis and had 100.0% positivity. The only adult specimen of P. geniculatus captured in the intradomicile in Amaporã, as well as the nymph of Triatoma in the peridomicile in Paiçandu, were negative. The finding of P. megistus naturally infected by T. cruzi in households in rural area of Paraná demonstrates a potential risk of vector transmission of CD in these regions.

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Seroprevalence of Trypanosoma cruzi infection among blood donors in the state of Bahia, Brazil

Revista da Sociedade Brasileira de Medicina Tropical ◽

10.1590/0037-8682-0146-2019 ◽

2019 ◽

Vol 52 ◽

Cited By ~ 1

Author(s):

Diego Lopes Paim Miranda ◽

Gilmar Ribeiro Jr ◽

Fernanda Cardoso Lanza ◽

Fred Luciano Neves Santos ◽

Renato Barbosa Reis ◽

...

Keyword(s):

Trypanosoma Cruzi ◽

Blood Donors ◽

The State ◽

Cruzi Infection

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Serological follow-up of Trypanosoma cruzi infection from 1987 to 1994 in 32 counties of the State of Jalisco, Mexico: preliminary report

Cadernos de Saúde Pública ◽

10.1590/s0102-311x1995000300026 ◽

1995 ◽

Vol 11 (3) ◽

pp. 501-505

Author(s):

Francisco Trujillo-Contreras ◽

Maria Angeles V. Yerenas

Keyword(s):

Immune Response ◽

South America ◽

Trypanosoma Cruzi ◽

Preliminary Report ◽

The State ◽

Laboratory Techniques ◽

The University ◽

Mexican Strains ◽

Cruzi Infection

In 1987 the University of Guadalajara performed a seroepidemiological survey on the prevalence of Chagas’ disease in the 124 counties of the State of Jalisco, Mexico, arriving at a rate of 21.6 per 100 inhabitants. From December 1993 to June 1994, we studied 2238 individuals from 32 rural counties in this State. Of these, we found 276 positives (12.33%) and 1962 negatives (87.66%). Nevertheless, the series of serological differences found are very striking, since out of the 655 individuals that were seropositive in 1987, we noted that 276 individuals remained positive, while 50 individuals (7.63%) became negative. There were no flaws in the laboratory techniques. We believe that either the immune response of Mexicans is different or that the virulence of the Mexican strains of Trypanosoma cruzi may be not as great as that in the South America countries.

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