The Occurrence of Antibody to Bluetongue Virus in New South Wales. II. Coastal Region and Age Distribution Surveys

Littlejohns, I. R.; Burton, R W

doi:10.1071/bi9880571

Cited by 8 publications

(2 citation statements)

References 3 publications

(3 reference statements)

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“…Convincing serological evidence that BLU-l infections occurred in 1980 was also found. These findings confirm previous conclusions, based on single-bleed surveys Littlejohns and Burton 1988), that both BLU-l and BLU-21 had infected cattle in this State. The presence of viruses of the EHD group had not previously been suspected but, from the results of this work, they may be more commonly responsible for inducing antibody reactive in the BLU GDP test than are those of the BLU group itself.…”

Section: Discussionsupporting

confidence: 83%

“…Its geographic distribution and annual variations in its prevalence and distribution have been described by Burton and Littlejohns (1988) and Littlejohns and Burton (1988). GDP tests for BLU have generally been considered to be group-specific (Klontz et al 1963;Jochim 1976) and the antigen used in the work reported here was shown by Sharp et al (1988) to be shared by two other Australian BLU virus serotypes, but not by three members of the Palyam (PAL) group.…”

Section: Introductionmentioning

confidence: 97%

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Bluetongue and Related Viruses in New South Wales: Isolations from, and Serological Tests on Samples from Sentinel Cattle

Ir¹,

Rw²,

Jm³

1988

Aust. Jnl. Of Bio. Sci.

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Sentinel cattle at a number of localities in northern and central coastal New South Wales were sampled over the summer and autumn seasons of the years 1979, 1980 and 1981. A total of 118 orbiviruses were isolated; 99 were of the Palyam group, 15 were of the epizootic haemorrhagic disease (EHD) of deer group, and 4 of the bluetongue group. The Palyam group viruses were identified by serotype as 68 Bunyip Creek, 23 CSIRO Village, 7 D' Aguilar and one was not typed. The EHD viruses were identified as 13 type 5 and 2 type 6. All 4 bluetongue viruses were type 21. There was also convincing serological evidence that bluetongue type 1 infection occurred in 1980.Antibody to the bluetongue group, as demonstrated in a gel diffusion precipitin test, was often transient. It appeared to be mostly cross-reactive with, and induced by, other orbivirus infections, particularly those of the EHD group. Viruses of the Palyam group also seemed to be implicated in some circumstances. Where infections by viruses of the bluetongue group were demonstrated, the precipitating antibody responses to a bluetongue group antigen were not noticeably stronger than many which followed EHD virus infection.The results generally confirm previous conclusions, deduced from serological surveys, regarding the frequency of orbivirus infections, the presence of bluetongue viruses, and the transient nature of many bluetongue group antibody reactions.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 97%

Bluetongue and Related Viruses in New South Wales: Isolations from, and Serological Tests on Samples from Sentinel Cattle

Ir¹,

Rw²,

Jm³

1988

Aust. Jnl. Of Bio. Sci.

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The use of discriminant analysis in predicting the distribution of bluetongue virus in Queensland, Australia

1994

Vet Res Commun

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The climatic variables that were most useful in classifying the infection status of Queensland cattle herds with bluetongue virus were assessed using stepwise linear discriminant analysis. A discriminant function that included average annual rainfall and average daily maximum temperature was found to correctly classify 82.6% of uninfected herds and 72.4% of infected herds. Overall, the infection status of 74.1% of herds was correctly classified. The spatial distribution of infected herds was found to parallel that of the suspected vector, Culicoides brevitarsis. This evidence supports the role of this arthropod species as a vector of bluetongue viruses in Queensland. The effect of potential changes in temperature and rainfall (the so-called 'global warming' scenario) on the distribution of bluetongue virus infection of cattle herds in Queensland was then investigated. With an increase in both rainfall and temperature, the area of endemic bluetongue virus infection was predicted to extend a further 150 km in and in southern Queensland. The implications of this for sheep-raising in Queensland are discussed.

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Simulation modeling of the effect of climatic factors on bluetongue virus infection in Australian cattle herds. II. Model experimentation

Carpenter

1996

Preventive Veterinary Medicine

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The Occurrence of Antibody to Bluetongue Virus in New South Wales. II. Coastal Region and Age Distribution Surveys

Cited by 8 publications

References 3 publications

Bluetongue and Related Viruses in New South Wales: Isolations from, and Serological Tests on Samples from Sentinel Cattle

Bluetongue and Related Viruses in New South Wales: Isolations from, and Serological Tests on Samples from Sentinel Cattle

The use of discriminant analysis in predicting the distribution of bluetongue virus in Queensland, Australia

Simulation modeling of the effect of climatic factors on bluetongue virus infection in Australian cattle herds. II. Model experimentation

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