TY - RPRT TI - Cytotoxin-negative Clostridium difficile. AU - M H Beaman AU - T V Riley PY - 1990 DO - 10.1111/j.1445-5994.1990.tb00382.x UR - https://pubmed.ncbi.nlm.nih.gov/2322209/ ID - 2322209 ER -