Mycobacterium avium subspecies paratuberculosis in free-living amoebae isolated from fields not used for grazing.
White
C I
CI
Faculty of Veterinary Science, University of Liverpool, Leahurst, Chester High Road, Neston, Cheshire CH64 7TE.
Birtles
R J
RJ
Wigley
P
P
Jones
P H
PH