Riggs MM, Sethi AK, Zabarsky TF, Eckstein EC, Jump RL, Donskey CJ (October 2007). «Asymptomatic carriers are a potential source for transmission of epidemic and nonepidemic Clostridium difficile strains among long-term care facility residents». Clinical Infectious Diseases. 45 (8): 992–8. doi:10.1086/521854. PMID17879913.
Riggs MM, Sethi AK, Zabarsky TF, Eckstein EC, Jump RL, Donskey CJ (October 2007). «Asymptomatic carriers are a potential source for transmission of epidemic and nonepidemic Clostridium difficile strains among long-term care facility residents». Clinical Infectious Diseases. 45 (8): 992–8. doi:10.1086/521854. PMID17879913.