Density-dependent timing of defaecation by Rhodnius prolixus, and its implications for the transmission of Trypanosoma cruzi

Kirk, Marionne L.; Schofield, Christopher J.

doi:10.1016/0035-9203(87)90262-8

Cited by 26 publications

(11 citation statements)

References 1 publication

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“…The dependence of defaecation time on the quantity of blood ingested was also observed for T. infestans (Trumper & Gorla 1991) and R. prolixus (Kirk & Schofield 1987). The relationtively did not defaecate.…”

Section: Discussionmentioning

confidence: 59%

Feeding and defaecation patterns in Triatoma sordida

Crocco¹,

Catalá²

1996

Mem. Inst. Oswaldo Cruz

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Section: Discussionmentioning

confidence: 59%

Feeding and defaecation patterns in Triatoma sordida

Crocco¹,

Catalá²

1996

Mem. Inst. Oswaldo Cruz

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“…The dependence of defecation time on the quantity of ingested blood was observed in T. infestans (Trumper & Gorla 1991) and Rhodnius prolixus (Kirk & Schofield 1987); these two variables show a similarity in the feedingdefecation interval. A minimum blood feeding of 80 mg was enough for defecations to occur during feeding by 5 th instar nymphs, while nymphs of the 5 th instar of T. infestans, which fed on the same quantity of blood, had a feeding-defecation interval of 15 min after feeding (Trumper & Gorla 1991).…”

Section: Discussionmentioning

confidence: 88%

“…These data may predict differences between the abilities of these species as vectors (Mello 1980, Kirk & Schofield 1987, Trumper & Gorla 1991, Crocco & Catalá 1996.…”

mentioning

confidence: 99%

Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Loza-Murguia¹,

Noireau²

2010

Neotrop. entomol.

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-Triatoma guasayana (Wygodzinsky & Abalos) is a peridomestic triatomine with epidemiological importance in Bolivia, that may play an important role in the transmission of Trypanosoma cruzi (Chagas). In this study, two parameters of vectorial capacity were evaluated: the interval of feeding-defecation time and metacyclogenesis, in adult males and females and nymphal instars II to V of T. guasayana with comparisons with Triatoma infestans (Klug) and T. sordida (Stal). The results showed a close relationship between ingestion of blood and beginning of defecation. Values were negative in T. infestans, and T. sordida for instars II, III, IV, and V and also males and females but were positive in female T. sordida. Triatoma guasayana showed only negative values for instar II. Adults and nymphs began defecation as soon as they had finished feeding and required an average of 29.8 min. The analysis of metacyclogenesis showed that T. guasayana was superior to T. infestans and T. sordida. However, the vectorial effectiveness of T. guasayana was significantly affected regarding the percentage of metacyclic trypomastigotes during instars III to V and showed a progressive increase. Females had higher proportions despite their ingestion being half that of T. infestans. The different instars of T. guasayana had a higher parasitic load than those of T. sordida and, although ingestion was 1/3 of that of female T. infestans, there was a progressive increase in metacyclic trypomastigotes in the different nymphal stages of T. guasayana that decreased in adults.

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“…This strengthens the view that the threshold domestic abundance of T. infestans below which transmission of T. cruzi to dogs and cats is unlikely was very low, if any threshold exists at all, and undetectable within the imprecision of vector sampling methods. Experimental studies showed that bloodmeal size of triatomine bugs correlated negatively with time to first defecation which, combined with other laboratory and field studies, was used to suggest that low-density bug populations with increased feeding success would pose the greatest risk of T. cruzi transmission (Kirk and Schofield, 1987). While the likelihood of transmission per feeding contact with the host may or may not increase at low bug densities, the cumulative probability of T. cruzi transmission over all feeding contacts between bugs and hosts during the relevant exposure period will increase with increasing densities of infected bugs (Fig.…”

Section: Discussionmentioning

confidence: 95%

Domestic dogs and cats as sources ofTrypanosoma cruziinfection in rural northwestern Argentina

et al. 2006

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SUMMARYThe reservoir capacity of domestic cats and dogs for Trypanosoma cruzi infection and the hostfeeding patterns of domestic Triatoma infestans were assessed longitudinally in 2 infested rural villages in north-western Argentina. A total of 86 dogs and 38 cats was repeatedly examined for T. cruzi infection by serology and/or xenodiagnosis. The composite prevalence of infection in dogs (60%), but not in cats, increased significantly with age and with the domiciliary density of infected T. infestans. Dogs and cats had similarly high forces of infection, prevalence of infectious hosts (41-42%), and infectiousness to bugs at a wide range of infected bug densities. The infectiousness to bugs of seropositive dogs declined significantly with increasing dog age and was highly aggregated. Individual dog infectiousness to bugs was significantly autocorrelated over time. Domestic T. infestans fed on dogs showed higher infection prevalence (49%) than those fed on cats (39%), humans (38%) or chickens (29%) among 1085 bugs examined. The basic reproduction number of T. cruzi in dogs was at least 8·2. Both cats and dogs are epidemiologically important sources of infection for bugs and householders, dogs nearly 3 times more than cats.

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Density-dependent timing of defaecation by Rhodnius prolixus, and its implications for the transmission of Trypanosoma cruzi

Cited by 26 publications

References 1 publication

Feeding and defaecation patterns in Triatoma sordida

Feeding and defaecation patterns in Triatoma sordida

Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Domestic dogs and cats as sources ofTrypanosoma cruziinfection in rural northwestern Argentina

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