Table 2. Phage carriage in 91 C. difficile 027 isolates in relation to their different pulsovar types.

Pulsovar type	Number of isolates	Morphology of phage isolated	Exceptions
I	53	Defective myovirus	71L (PT-LPs)*
II	1	Defective myovirus	-
III	2	Siphovirus	-
IV	33	PT-LPs*	10 isolates (Myovirus A, E and defective myovirus B, C)
V	2	PT-LPs*	36L (No phage)

^*, Phage tail-like particles.

Prophage carriage among the 91 C. difficile 027 induced using mitomycin C or norfloxacin was also correlated to their pulsovar types. Pulsovar types I and II yielded defective myoviruses with one exception in Pulsovar I (isolate 71L) which yielded only phage tail-like particles (PT-LPs). Pulsovar type III yielded siphoviruses. Pulsovar types IV and V yielded phage tail-like particles with ten exceptions in Pulsovar type IV and one in Pulsovar type V.