But then it was learned that the disease caused by the O157 bacterium is infectious and was being spread beyond the original victims through person-to-person contact.
(the disease; caused; by the O157 bacterium) (the disease caused by the O157 bacterium; was being spread; beyond the original victims)
the disease the disease caused by the O157 bacterium
caused was being spread
by the O157 bacterium
beyond the original victims