Antibiotic Treatment of Clostridium difficile Carrier Mice Triggers a Supershedder State, Spore-Mediated Transmission, and Severe Disease in Immunocompromised Hosts

作者：Trevor D. Lawley, Simon Clare, Alan W. Walker, David Anthony Goulding, Richard A. Stabler, Nicholas J. Croucher, Pietro Mastroeni, Paul J. Scott, Claire L. Raisen, Lynda Mottram, Neil F. Fairweather, Brendan W. Wren, Julian Parkhill, Gordon Dougan · 发表于：Infection and Immunity · 年份：2009 · DOI：10.1128/iai.00558-09 · 被引用次数：361 · 研究领域：Clostridium difficile and Clostridium perfringens research、Gut microbiota and health、Microscopic Colitis

Clostridium difficile persists in hospitals by exploiting an infection cycle that is dependent on humans shedding highly resistant and infectious spores. Here we show that human virulent C. difficile can asymptomatically colonize the intestines of immunocompetent mice, establishing a carrier state that persists for many months. C. difficile carrier mice consistently shed low levels of spores but, surprisingly, do not transmit infection to cohabiting mice. However, antibiotic treatment of carriers triggers a highly contagious supershedder state, characterized by a dramatic reduction in the intestinal microbiota species diversity, C. difficile overgrowth, and excretion of high levels of spores. Stopping antibiotic treatment normally leads to recovery of the intestinal microbiota species diversity and suppresses C. difficile levels, although some mice persist in the supershedding state for extended periods. Spore-mediated transmission to immunocompetent mice treated with antibiotics results in self-limiting mucosal inflammation of the large intestine. In contrast, transmission to mice whose innate immune responses are compromised (Myd88(-/-)) leads to a severe intestinal disease that is often fatal. Thus, mice can be used to investigate distinct stages of the C. difficile infection cycle and can serve as a valuable surrogate for studying the spore-mediated transmission and interactions between C. difficile and the host and its microbiota, and the results obtained should guide in...