Dear colleagues, I am interested about the cattle infectious diseases which had a big impact for the local cattle populations in the Eastern Europe for the period from early Mediaeval period till the historic times. For today are known many infectious diseases, but earlier the animal disease nature was not always clearly known. I wish to know if there are any facts about huge epidemic disease, caused by cattle plague, or something similar, happened in the period from 12 century till 17 century in the Eastern Europe, especially Poland, Russia, Latvia? If yes, how big was economical impact, which part of the population died, which disease was the reason? Key words: Cattle population, infectious disease, Mediaeval period, plague. Jurgita Baubliene doctoral student Lithuanian veterinary academy Osteological laboratory Department of Anatomy and Histology -- dr. Linas Daugnora Osteological Laboratory Department of Anatomy and Physiology Lithuanian Veterinary Academy Phone +370 7 36 19 03, fax +370 7 36 24 17 http://www.lva.lt/vetzoo