an epidemiological study of canine filarioses in north-west italy: what has changed in 25 years?a field survey aimed at updating knowledge of the distribution and prevalence of filarial infections in the piedmont region was undertaken. blood samples were collected from 2628 dogs (10-15 dogs/100 km2) which had remained in the local area, were kept in the open overnight, were more than 2 years old and had not previously been treated with microfilaricidal drugs. infection was diagnosed by a modified knott test. comparison of the results with those from a similar survey carried out 25 years ag ...19968865572
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