Hep B?
Dynamite accidents resulting in bone fragments as shrapnel. Two rednecks were drinking beer and fishing with dynamite. One lit the fuse and held the dynamite too long. It blew up in his hand resulting in a traumatic amputation just below the elbow. Fragments of finger, hand and arm bone were blown into his eyes and chest and his buddy's back and side. I was digging bone fragments and fingernails out of both of them as long as three months later. This happened in the 70's so we had no blood tests for Hep B or C although I wouldn't have been surprised if either were already infected.