1
|
Valentinuzzi/ VS, Abrahan LB. An increased number of individuals of a potential host facilitates non-photic synchronisation in the haematophagous insect Triatoma infestans. Mem Inst Oswaldo Cruz 2023; 118:e220289. [PMID: 37531507 PMCID: PMC10392893 DOI: 10.1590/0074-02760220289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 06/19/2023] [Indexed: 08/04/2023] Open
Abstract
BACKGROUND Triatoma infestans (Kissing bug) is the main vector of the parasite causative of Chagas disease in Latin-America. This species shows clear activity rhythms easily synchronised to day-night cycles (photic cycle). The haematophagous nature of these insects lead us to think that they may temporally adapt to the particular activity rhythms of potential hosts (non-photic cycle). Our previous data showed that kissing bugs were weakly affected by the activity-inactivity rhythm of a single host. OBJETIVE To determine if by increasing the number of individuals of a potential host, T. infestans could increase the likelihood of synchronisation. METHODS Individual activity rhythms of experimental insects, maintained in constant darkness in light-tight cabinets, localised in a room with 24 rodents, were continuously monitored. Another insect group that served as control was maintained in the same conditions but in a room without rodents. FINDINGS Most of the experimental insects synchronised, expressing a 24 h period coincident with the activity-inactivity rhythms of the rodents, while the controls free ran with a period significantly longer than 24 h. CONCLUSION Analogous to what happens with high vs low light intensity in photic synchronisers, a high number of rodents, in contrast to the previous one-rodent experiment, increased the potency of this non-photic zeitgeber.
Collapse
Affiliation(s)
- Veronica Sandra Valentinuzzi/
- Centro Regional de Investigaciones Científicas y de Transferencia Tecnológica de La Rioja, Universidad Nacional de La Rioja, Servicio Geológico Minero Argentino, Universidad Nacional de Catamarca, Consejo Nacional de Investigaciones Científicas y Técnicas, Entre Ríos y Mendoza, La Rioja, Argentina
| | - Luciana Beatriz Abrahan
- Centro Regional de Investigaciones Científicas y de Transferencia Tecnológica de La Rioja, Universidad Nacional de La Rioja, Servicio Geológico Minero Argentino, Universidad Nacional de Catamarca, Consejo Nacional de Investigaciones Científicas y Técnicas, Entre Ríos y Mendoza, La Rioja, Argentina
| |
Collapse
|
2
|
Santos JPD, Guimarães LM, Lima IP, Batista FMDA, Carvalho-Costa FA, Santos-Mallet JRD. Spatial distribution of synanthropic triatomines in Piaui State, Northeastern Brazil. Rev Inst Med Trop Sao Paulo 2020; 62:e57. [PMID: 32844905 PMCID: PMC7447235 DOI: 10.1590/s1678-9946202062057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 07/21/2020] [Indexed: 12/02/2022] Open
Abstract
This study aimed to describe the spatial distribution and assess entomological indicators of synanthropic triatomines in Piaui State, Northeastern Brazil. We used surveillance data on the detection, identification and assessment of natural infection with trypanosomatids from triatomines in the State from 2014 to 2017. The State was divided into four macroregions. In relation to the dispersion rates of triatomines, they were much lower in the North, when compared to Southwest, Southeast and Central North macroregions. Infestation rates were higher in the Southwest and Southeast and intradomicile infestation rates varied during the study period, reaching high values in all regions. Insects belonging to the species Triatoma brasiliensis complex, Triatoma pseudomaculata, Triatoma sordida, and to the genus Panstrongylus spp. and Rhodnius spp. were collected during this period. T. brasiliensis was collected from all four regions of the State, but more frequently in those located in the Southeast. A similar pattern was observed for T. pseudomaculata. T. sordida was detected in the municipalities in the Southeast and Southwest regions, and less frequently in the Central North municipalities. Rhodnius spp. was detected in the Central North and North regions, and Panstrongylus spp. in the Central North and Southeast regions. The highest trypanosomatid-positivity rate of T. brasiliensis and Panstrongylus spp. was in the Southeast region. A significant proportion of the municipalities of Piaui State presents entomological parameters that indicate a risk of Chagas disease by vector transmission.
Collapse
Affiliation(s)
| | - Lucas Melo Guimarães
- Departamento de Epidemiologia em Saúde Pública, Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | - Filipe Anibal Carvalho-Costa
- Escritório Técnico Regional, Fundação Oswaldo Cruz, Teresina, Piauí, Brazil.,Laboratório de Epidemiologia e Sistemática Molecular, Fundação Oswaldo Cruz, Instituto Oswaldo Cruz,nRio de Janeiro, Rio de Janeiro, Brazil
| | - Jacenir Reis Dos Santos-Mallet
- Escritório Técnico Regional, Fundação Oswaldo Cruz, Teresina, Piauí, Brazil.,Laboratório Interdisciplinar de Vigilância Entomológica em Diptera e Hemiptera, Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil.,Universidade Iguaçu, Nova Iguaçu, Rio de Janeiro, Brazil
| |
Collapse
|
3
|
Abrahan L, Lopez P, Amelotti I, Cavallo MJ, Stariolo R, Catalá S, Cueto G, Valentinuzzi V. Activity levels of female Triatoma infestans change depending on physiological condition. Parasit Vectors 2018; 11:534. [PMID: 30285844 PMCID: PMC6167819 DOI: 10.1186/s13071-018-3117-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/18/2018] [Indexed: 11/24/2022] Open
Abstract
Background Triatoma infestans (Hemiptera: Reduviidae) is the main vector of Trypanosoma cruzi, the etiological agent of Chagas disease, in South America. Active dispersal of this vector is the principal cause of recolonization of human dwellings previously treated with insecticides. Due to the persistence of vector populations and their movement between habitats, dispersive behavior studies are important for understanding the epidemiology of Chagas disease. The aim of this study was to analyze the relationship among T. infestans females’ activity levels according to their physiological conditions. Results Two groups of insects were used, unfed and fed females. Each was composed of three subgroups in relation to the reproductive state: fifth-stage nymphs, virgin and fertilized females. There was a significant interaction between reproductive and nutritional states among T. infestans female’ activity levels. During the experiments, unfed and fed nymphs remained inactive. Virgin females showed a dual behavior in their movement; fasted insects were more active. Fertilized females, both fed and unfed, were always active. Conclusion The reproductive and nutritional conditions of T. infestans females affect their activity levels. When females with different reproductive states remained together, fertilized females showed permanent activity levels, suggesting that this subgroup of females represents the highest epidemiological risk as colonizers of human dwellings. Electronic supplementary material The online version of this article (10.1186/s13071-018-3117-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Luciana Abrahan
- Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), UNLAR, SEGEMAR, UNCa, CONICET, Anillaco, La Rioja, Argentina.
| | - Pablo Lopez
- Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), UNLAR, SEGEMAR, UNCa, CONICET, Anillaco, La Rioja, Argentina
| | - Ivana Amelotti
- Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), UNLAR, SEGEMAR, UNCa, CONICET, Anillaco, La Rioja, Argentina.,Universidad Nacional de La Rioja, La Rioja, Argentina
| | - María José Cavallo
- Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), UNLAR, SEGEMAR, UNCa, CONICET, Anillaco, La Rioja, Argentina
| | - Raúl Stariolo
- Centro de Referencia de Vectores, Santa María de Punilla, Córdoba, Argentina
| | - Silvia Catalá
- Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), UNLAR, SEGEMAR, UNCa, CONICET, Anillaco, La Rioja, Argentina
| | - Gerardo Cueto
- Instituto de Ecología, Genética y Evolución de Buenos Aires, Buenos Aires, Argentina
| | - Verónica Valentinuzzi
- Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), UNLAR, SEGEMAR, UNCa, CONICET, Anillaco, La Rioja, Argentina
| |
Collapse
|