Model based on weather variables to predict seroconversion to bluetongue virus in Alabama cattle

Wright, James C.; Getz, Rodger R.; Powe, T.A.; Nusbaum, Kenneth E.; Stringfellow, D.A.; Mullen, Gary R.; Lauerman, L. H.

doi:10.1016/0167-5877(93)90043-s

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…Bluetongue infection in cattle has been associated with rainfall 1Ð3 mo earlier in Australia (Ward andThurmond 1995, Ward 1996) and total rain days 2 wk earlier in the eastern United States (Wright et al 1993). In southern California, summer rains generally do not occur, and precipitation from June through mid-fall was negligible for each year of this study.…”

Section: Discussionmentioning

confidence: 96%

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Seasonal Transmission of Bluetongue Virus by <I>Culicoides sonorensis</I> (Diptera: Ceratopogonidae) at a Southern California Dairy and Evaluation of Vectorial Capacity as a Predictor of Bluetongue Virus Transmission

Gerry¹,

Mullens²,

Maclachlan³

et al. 2001

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Vectorial capacity of Culicoides sonorensis Wirth & Jones for the transmission of bluetongue (BLU) virus was examined at a southern California dairy from January 1995 to December 1997. Insects were collected one to two times per week in five CDC-type suction traps (without light) baited with CO2 at a constant release rate of 1,000 ml/min. BLU virus was detected in midges collected from May through December with an estimated overall infection rate of 0.08%. The BLU virus infection rate of field-captured midges was not correlated with sentinel calf seroconversions to BLU virus. Sentinel calf seroconversions were highly seasonal, occurring from August through November with most calves seroconverting during September and October. Vector competence of field-collected nulliparous flies fed a locally acquired serotype of BLU virus in the laboratory was stable among years (17-23%). Vectorial capacity was strongly correlated with BLU virus transmission (measured by sentinel calf seroconversions) during 1995 and 1996, but not during 1997. Host biting rate estimated for traps nearest to the sentinel calves was the index best correlated with BLU virus transmission for all study years and was most highly correlated with sentinel seroconversions 4 wk later. The utility of vectorial capacity and its component variables is discussed for this system.

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Section: Discussionmentioning

confidence: 96%

“…In Australia, seroconversion of sentinel cattle was correlated with Þeld temperatures 1 mo earlier (Ward 1996). However, seroconversion of sentinel cattle in Alabama was not correlated with mean daily temperatures (Wright et al 1993).…”

Section: Discussionmentioning

confidence: 97%

Seasonal Transmission of Bluetongue Virus by <I>Culicoides sonorensis</I> (Diptera: Ceratopogonidae) at a Southern California Dairy and Evaluation of Vectorial Capacity as a Predictor of Bluetongue Virus Transmission

Gerry¹,

Mullens²,

Maclachlan³

et al. 2001

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“…Seroconversion to BTV in cattle, based on a microimmunodiffusion test, was modeled using several variables related to temperature, precipitation, and humidity in Alabama. 43 Seroconversion was positively associated with the mean daily hours of wet vegetation and negatively associated with total precipitation during the weeks before seroconversion. Another study of cattle in Nebraska, North Dakota, and South Dakota, studied the association between seropositivity of antibodies to BTV and several environmental variables, based on a competitive enzyme-linked immunosorbent assay (ELISA) test, and found that herds at lower latitude and higher altitude had greater odds of being classified as BTV-positive herds.…”

Section: Introductionmentioning

confidence: 99%

Climate, Landscape, and the Risk of Orbivirus Exposure in Cattle in Illinois and Western Indiana

Boyer¹,

Ward²,

Singer³

2010

The American Society of Tropical Medicine and Hygiene

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Abstract. Climate and environmental data were used to estimate the risk of testing positive for antibodies to bluetongue (BTV) and epizootic hemorrhagic disease viruses (EHDV) in cattle in Illinois and western Indiana over three transmission seasons (2000)(2001)(2002). The risks of BTV and EHDV seropositivity were positively associated with temperature during every year of the study. The EHDV seropositivity was also positively associated with forest patchiness in two of the years. During 2002, a year with unusually high spring rainfall, forest patchiness was not significantly associated with EHDV but spring rainfall did have a moderating effect on temperature. Maps of predicted probability of exposure to BTV or EHDV were created using these best-fitting models and show distinctly different spatial patterns within the same cattle population.

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“…Higher winter and summer temperatures in Virginia probably increase vector capacity and competence (Gibbs, 1992;Wright et al, 1993;Purse et al, 2005;Saegerman et al, 2008) by increasing the vector's ability to acquire, maintain, and transmit the virus. In particular, higher summer temperatures will enhance replication of the virus within the vector, resulting in higher viral load and decreased extrinsic incubation period.…”

mentioning

confidence: 99%

“…Vector-borne pathogens are considered to be particularly sensitive to variations in climate (Purse et al, 2005), and previous studies of BLU virus exposure of domestic ruminants have indicated that climatic variables, such as temperature, rainfall, and humidity, may be important for viral transmission by increasing vector capacity and competence (Gibbs and Greiner, 1989;Gibbs, 1992;Wright et al, 1993). Consequently, the objective of this study was to determine whether selected climatic conditions were associated with annual percentage of white-tailed deer from Virginia with hoof wall growth interruptions, which was used as an indicator of annual incidence of HD.…”

mentioning

confidence: 99%

Incidence of Hemorrhagic Disease in White-Tailed Deer Is Associated with Winter and Summer Climatic Conditions

et al. 2009

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Hemorrhagic disease (HD) is an important vector-borne disease of white-tailed deer (Odocoileus virginianus). The objective of this study was to determine whether temperature and precipitation were associated with a measure of annual incidence of HD in white-tailed deer from Virginia. The annual percentages of deer with hoof wall growth interruptions (a clinical sign of HD) from four climate divisions in the HD endemic area of Virginia recorded during 1993-2006 were used as indicators of annual HD incidence. Pearson's correlation coefficients between these indicators of incidence and average temperature (degrees F) or total precipitation (in.) for each month, as well as for winter (January-February), early summer (June-July), and late summer/fall (August-September-October) seasons were calculated. Strong direct correlations between the measure of annual HD incidence and average temperature for winter (r = 0.39, P = 0.003, n = 57), early summer (r = 0.51, P < 0.0001, n = 57), and late summer/fall (r = 0.42, P = 0.001, n = 57) were evident. There also was a strong inverse correlation between the measured annual HD incidence and June precipitation (r = -0.44, P = 0.0006, n = 57). Poisson regression models of seasonal temperatures and June precipitation to annual percentage of deer with hoof wall growth interruptions were developed. Based on Akaike's Information Criterion with small sample size correction (AICc), the global model was selected as the top model. Higher winter and summer temperatures may increase vector capacity and competence, and lower precipitation in June may create favorable breeding sites for midges.

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Model based on weather variables to predict seroconversion to bluetongue virus in Alabama cattle

Cited by 12 publications

References 5 publications

Seasonal Transmission of Bluetongue Virus by <I>Culicoides sonorensis</I> (Diptera: Ceratopogonidae) at a Southern California Dairy and Evaluation of Vectorial Capacity as a Predictor of Bluetongue Virus Transmission

Seasonal Transmission of Bluetongue Virus by <I>Culicoides sonorensis</I> (Diptera: Ceratopogonidae) at a Southern California Dairy and Evaluation of Vectorial Capacity as a Predictor of Bluetongue Virus Transmission

Climate, Landscape, and the Risk of Orbivirus Exposure in Cattle in Illinois and Western Indiana

Incidence of Hemorrhagic Disease in White-Tailed Deer Is Associated with Winter and Summer Climatic Conditions

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