The Effect of Climate on the Presence of Culicoides imicola in Italy

Wiley - Tập 50 Số 3 - Trang 139-147 - 2003
Annamaria Conte1, Armando Giovannini1, Lara Savini1, Maria Goffredo1, Paolo Calistri1, R. Meiswinkel1,2
1Addresses of authors: Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise, Via Campo Boario, Teramo, 64100, Italy
2Onderstepoort Veterinary Institute (OVI), P/Bag X05 Onderstepoort 0110, South Africa

Tóm tắt

SummaryA model was developed to classify the Italian territories in relation to their suitability to harbour populations of Culicoides imicola and, as a consequence, also able to sustain a bluetongue (BT) epidemic. Italy was subdivided into 3507 10 × 10 km cells. In 546 cells at least one collection was made. The cell was considered the unit for all subsequent analyses. Culicoides were collected using Onderstepoort‐type blacklight traps. Some traps were operated weekly at chosen sites; the remainder were moved almost daily to new sites. Only the results obtained during the peak August–November period were used, to exclude bias caused by the seasonality of C. imicola. Climate data for the period 1999–2001 were obtained from 80 weather stations. Multiple logistic regression was performed using the presence or absence of C. imicola in a specific cell as the dependent variable. Annual means of daily values for minimum temperature and minimum relative humidity, and the mean altitude above sea level, were the independent variables. The probability of occurrence of C. imicola in each grid cell was used to create a prediction map for Italy. The model was able to correctly classify 77.5% of the 546 grid cells in which at least one collection had been made. Culicoides imicola was found frequently through much of Sardinia, in parts of southern Italy, and further north along the Tyrrhenian coast, but was absent from along most of the Adriatic coast, and the internal mainland, and from most of Sicily. Six detailed maps are provided. Also mapped are areas where the probability of the occurrence of C. imicola is lower than 5%. This identification of possible mountainous C. imicola‐free areas in central Italy could facilitate safer animal trade and transhumance, even if BT infections in traded animals or moving stock, were to go undetected. Needless to say this depends upon no cool‐adapted species of Culicoides being involved in the transmission of BT disease.

Từ khóa


Tài liệu tham khảo

10.1111/j.1365-2915.1997.tb00397.x

10.4102/jsava.v70i2.759

10.1136/vr.149.21.639

Boorman J., 1985, Bluetongue and Related Orbiviruses, 187

Braverman Y., 2001, The interaction between climatic factors and bluetongue outbreaks in Israel and the eastern Mediterranean, and the feasibility of establishing bluetongue‐free zones, Israel J. Vet. Med., 56, 99

Calistri P. M.Goffredo R.Meiswinkel andV.Caporale 2003:The distribution ofCulicoides imicolain Italy: application and evaluation of current Mediterranean models based on climate. J. Vet. Med. B50 132–138(this issue).

Coluzzi M., 1964, Contributo alla conoscenza dei Culicoidi Italiani, Parassitologia, 6, 63

Cox D. R., 1970, The Analysis of Binary Data

Goffredo M., 2001, The 2000 Bluetongue virus (BTV) outbreak in Italy: distribution and abundance of the principal vector Culicoides imicola Kieffer, Proc. Int. Symp. Veterinary Laboratory Diagnosticians, 4

Hosmer D. W., 1989, Applied Logistic Regression

Kieffer J. J., 1919, Chironomides d'Europe conservés au Musée National Hongrois de Budapest, Annales Historiae Naturalis Musei Nationalis Hungarici, 17, 1

Lessard P., 1990, Geographical information systems for studying the epidemiology of cattle diseases caused by Theileria parva, Vet. Rec., 126, 255

Mellor P. S. andC. J.Leake 2000:Climatic and geographic influences on arboviral infections and vectors.Revue Scientifique et Technique de l'Office International des Epizooties 19 41–54.

Rondani C. 1869:Di alcuni insetti dipteri che aiutano le fecondazione in diversii peringonii. Archivio per la Zoologia l'Anatomia e la Fisiologia serie 2 Bologna1 187–192.

Scaramozzino P., 1996, European Multicolloquial on Parasitology. Parassitologia, 124

Sellers R. F. andP. S.Mellor 1993:Temperature and the persistence of viruses inCulicoidesspp. during adverse conditions.Revue Scientifique et Technique de l'Office International des Epizooties12 733–755.

Siegel S., 1988, Nonparametric Statistics for the Behavioral Sciences

Venter G. J., 1994, The virtual absence of Culicoides imicola (Diptera: Ceratopogonidae) in the colder, high‐lying area of the eastern Orange Free State, South Africa, and its implications for the transmission of arboviruses, Onderstepoort J. Vet. Res., 61, 327

10.1136/vr.134.16.407

10.1016/0167-5877(95)00566-8

Wittmann E. J. P. S.Mellor andM.Baylis 2001:Using climate data to map the potential distribution ofCulicoides imicola(Diptera: Ceratopogonidae) in Europe.Revue Scientifique et Technique de l'Office International des Epizooties20 731–740.

10.1016/0167-5877(93)90043-S

Thông tin
Thông tin xuất bản

Wiley

Tập 50 Số 3

139-147

Thông tin tác giả