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Persistence of Ehrlichia phagocytophila infection in lambs in relation to clinical parameters and antibody responses
  1. S. Stuen, DVM, PhD1,
  2. E. Olsson Engvall, DVM, PhD2 and
  3. K. Artursson, DVM, PhD2
  1. 1 Department of Sheep and Goat Research, Norwegian College of Veterinary Medicine, PO Box 264, N-4301 Sandnes, Norway
  2. 2 National Veterinary Institute, PO Box 7073, S-75007 Uppsala, Sweden

Abstract

Five lambs were infected experimentally with Ehrlichia phagocytophila and examined regularly during the next six months. The lambs all had recurrences of parasitaemia at various times but had a fever on only 21 per cent of these occasions. A reduced number of leucocytes was observed in all the lambs for at least eight weeks. All the lambs were still infected four months after inoculation with E phagocytophila. After six months, blood from four of the five lambs was infective when inoculated into susceptible lambs.

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