Reclassification of equine isolates previously reported as Actinobacillus equuli, variants of A. equuli, Actinobacillus suis or Bisgaard taxon 11 and proposal of A. equuli subsp. equuli subsp. nov. and A. equuli subsp. haemolyticus subsp. nov - Christensen, H; Bisgaard, M; Olsen, J E (Int J Syst Evol Microbiol, 2002)