Studies on Rift Valley fever in some African murids (<i>Rodentia</i>:<i>Muridae</i>)

Swanepoel, Robert; Blackburn, N. K.; S, Efstratiou; Condy, J. B.

doi:10.1017/s0022172400053535

Cited by 19 publications

(9 citation statements)

References 12 publications

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“…When a vertebrate host's viremia was calculated to be negative the daily infectiousness was set to zero as discussed in the methodology. References: Bovids: [48] – [51] ; Birds: [52] (Turell unpublished data); Primate: [53] – [55] (Morrill unpublished data); Rodent: [56] – [65] .…”

Section: Resultsmentioning

confidence: 99%

Predicting the Mosquito Species and Vertebrate Species Involved in the Theoretical Transmission of Rift Valley Fever Virus in the United States

Golnar

Turell

LaBeaud³

et al. 2014

PLoS Negl Trop Dis

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Rift Valley fever virus (RVFV) is a mosquito-borne virus in the family Bunyaviridiae that has spread throughout continental Africa to Madagascar and the Arabian Peninsula. The establishment of RVFV in North America would have serious consequences for human and animal health in addition to a significant economic impact on the livestock industry. Published and unpublished data on RVFV vector competence, vertebrate host competence, and mosquito feeding patterns from the United States were combined to quantitatively implicate mosquito vectors and vertebrate hosts that may be important to RVFV transmission in the United States. A viremia-vector competence relationship based on published mosquito transmission studies was used to calculate a vertebrate host competence index which was then combined with mosquito blood feeding patterns to approximate the vector and vertebrate amplification fraction, defined as the relative contribution of the mosquito or vertebrate host to pathogen transmission. Results implicate several Aedes spp. mosquitoes and vertebrates in the order Artiodactyla as important hosts for RVFV transmission in the U.S. Moreover, this study identifies critical gaps in knowledge which would be necessary to complete a comprehensive analysis identifying the different contributions of mosquitoes and vertebrates to potential RVFV transmission in the U.S. Future research should focus on (1) the dose-dependent relationship between viremic exposure and the subsequent infectiousness of key mosquito species, (2) evaluation of vertebrate host competence for RVFV among North American mammal species, with particular emphasis on the order Artiodactyla, and (3) identification of areas with a high risk for RVFV introduction so data on local vector and host populations can help generate geographically appropriate amplification fraction estimates.

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Section: Resultsmentioning

confidence: 99%

Predicting the Mosquito Species and Vertebrate Species Involved in the Theoretical Transmission of Rift Valley Fever Virus in the United States

Golnar

Turell

LaBeaud³

et al. 2014

PLoS Negl Trop Dis

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“…Neutralization techniques utilizing cell cultures have been used in research (Swanepoel et al 1978), but more costly and laborious mouse tests have been used more commonly in surveys and diagnosis, particularly in early investigations.…”

Section: Resultsmentioning

confidence: 99%

Comparison of techniques for demonstrating antibodies to Rift Valley fever virus

Swanepoel

Struthers

Erasmus

et al. 1986

J. Hyg.

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SUMMARYNine serological techniques were compared by monitoring the response to infection with Rift Valley fever (RVF) virus in three sheep. Antibodies were monitored daily for the first 14 days after infection, then weekly and later fortnightly up to week 24. The earliest antibody response was detected in one sheep on day 3 by a plaque reduction neutralization test, and by day 6 antibodies were demonstrable in all three sheep by haemagglutination-inhibition, reversed passive haemagglutination-inhibition, immunodiffusion, indirect immunofluorescence (IF), enzyme-linked immunosorbent assay and neutralization ofcytopathic effect in cell cultures. Antibodies were demonstrable by complement fixation on day 8 at the earliest. IF and the two neutralization techniques produced the highest titres, but all tests could be used satisfactorily for the serological diagnosis of RVF. Inactivated antigen could be used for all except the neutralization tests. A radioimmunoassay technique using l251-labelled staphylococcal protein A detected antibodies on day 8 at the earliest and produced lower mean titres than some of the other techniques. This was probably because sheep immunoglobulins bind protein A poorly.

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“…Our reproductive study may have importance from an epidemiological point of view as well as implications for agriculture. Because of periodic population irruptions (Withers, Louw & Henschel, 1980), some members of the genus have been implicated in causing plague (Hallett, McNeill & Meyer, 1970; Isaacson, Taylor & Arntzen, 1983), Rift Valley fever (Swanepoel et al , 1978) and schistosomiasis (Gear, Davis & Pitchford, 1966), and in causing damage to agricultural products (Smithers, 1971; Wilson, 1975). It is possible that our reproductive data may either directly or indirectly assist health and agricultural authorities responsible for potentially problematic rodents within the context of reproductive seasonality.…”

Section: Discussionmentioning

confidence: 99%

Reproductive seasonality in the Tete veld rat (Aethomys ineptus) (Rodentia: Muridae) from southern Africa

2006

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Very little is known about the reproductive biology of the recently recognized Tete veld rat Aethomys ineptus. In the present study, we investigated the seasonality of reproduction in this newly recognized rodent using a number of histological and endocrinological parameters. Body mass, reproductive tract morphometrics, gonadal histology, and plasma testosterone concentrations in males and plasma oestradiol-17b and progesterone concentrations in females were assessed from a population in the north-central part of South Africa over a 12-month period in order to ascertain the pattern of reproduction in the species.

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Studies on Rift Valley fever in some African murids (Rodentia:Muridae)

Cited by 19 publications

References 12 publications

Predicting the Mosquito Species and Vertebrate Species Involved in the Theoretical Transmission of Rift Valley Fever Virus in the United States

Predicting the Mosquito Species and Vertebrate Species Involved in the Theoretical Transmission of Rift Valley Fever Virus in the United States

Comparison of techniques for demonstrating antibodies to Rift Valley fever virus

Reproductive seasonality in the Tete veld rat (Aethomys ineptus) (Rodentia: Muridae) from southern Africa

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