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  • Title: Assessment of cattle grub (Hypoderma spp.) prevalence in northeastern Italy: an immunoepidemiological survey on bulk milk samples using ELISA.
    Author: Frangipane di Regalbono A, Capelli G, Otranto D, Pietrobelli M.
    Journal: Vet Parasitol; 2003 Feb 27; 111(4):343-50. PubMed ID: 12559713.
    Abstract:
    Hypodermosis is a myiasis of cattle mainly found in the Northern Hemisphere. In Italy it has been reported primarily in southern regions with a farm prevalence reaching a peak of 85%, while few data are available in the north of the country. This paper reports the results of a serological survey carried out on hypodermosis in Vicenza province (northeastern Italy). During January and February 1999, bulk milk samples were collected from 224 dairy farms and tested, using an hypodermosis ELISA kit. Epidemiological data, such as farm location, herd size, number of cows, grazing management, treatments against Hypoderma larvae, presence of imported animals, were gathered and statistically analysed in relation to the serological results. In 15 farms the presence of warbles was monitored by manual palpation and larvae collected for identification.Ninety-seven (43.3%) samples were detected as positive, whereas 12 (5.4%) and 115 (51.3%) were inconclusive and negative, respectively. Thirteen farms were positive upon parasitological examination and the larvae collected were identified as Hypoderma bovis.Seroprevalence was highly correlated with the practice of free grazing and slightly, but significantly, correlated with the number of cows on the farm. The mean antibody level of positive herds was significantly higher on farms without imported animals. On farms with warbled animals there was a high inverse correlation between antibody level and quantity of milk in the tanks and the number of lactating cows. The ELISA test on bulk milk samples has been shown, under field conditions, to be a useful, cost-effective and easy test for the diagnosis of bovine hypodermosis.
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