“…Non-toxigenic strains of C. diphtheriae have been increasingly reported as causes of invasive disease, including endocarditis, bacteraemia, septic arthritis and splenic abscesses (Alexander, 1984;Poilane et al, 1995;Patey et al, 1997;Belko et al, 2000;Mattos-Guaraldi et al, 2001;Funke et al, 1999). Nasopharyngeal carriage and disease caused by this organism have been documented amongst homeless people, intravenous drug users, alcoholics, Australian aborigines and the Northern Plains Indian Community (Gubler et al, 1998;Anonymous, 1997).…”