High incidence of pathogenic microorganisms in bone allografts explanted in the morgue.

We analyzed the influence of the environment on bacterial contamination in 431 bone allografts from 97 donors (68 multiorgan, grafts taken in the operation theater; 29 morgue donors). From each bone transplant we cultured two aerobic and two anaerobic tissue specimens. The overall contamination rate was 49% (theater 51%, morgue 40%). In grafts explanted in the morgue, we noted more pathogenic microorganisms (60%) than in multiorgan donors, explanted under aseptic surgical conditions (33%). We conclude that the harvesting environment constitutes the major source of pathogenic microorganisms.