On the other hand, endo- and peri-carditis are excessively rare.
Purpura rheumatica never seems to result in endo- or pericarditis.
word-forming element meaning "inside, within, internal," comb. form of Greek endon "in, within," literally "in the house of," from en "in" (see en- (2)) + base of domos "house" (see domestic).
endo- or end-pref. Inside; within: endometrium.