I |
1/2b, 3b, 4b |
Commonly isolated from various sources; overrepresented among human isolates |
Lowest diversity among the lineages; lowest levels of recombination among the lineages |
II |
1/2a, 1/2c, 3a, 3c |
Commonly isolated from various sources; overrepresented among food and food-related as well as natural environments |
Most diverse, highest recombination levels |
III |
4a, 4b, 4c |
Most isolates obtained from ruminants |
Very diverse; recombination levels between those for lineage I and lineage II |
IV |
4a, 4b, 4c |
Most isolates obtained from ruminants |
Few isolates analyzed to date |