| crimean-congo hemorrhagic fever: prevention and control limitations in a resource-poor country. | in autumn 2000, an outbreak of crimean-congo hemorrhagic fever (cchf) occurred in pakistan and involved nosocomial cases due to human-to-human transmission at a tertiary care hospital in karachi. during a hospital-based investigation, 6 serologically confirmed cases (i.e., patients seropositive for cchf antigen or anti-cchf immunoglobulin m antibodies by means of a capture enzyme-linked immunosorbent assay [elisa]) and 3 clinically confirmed cases (i.e., patients with negative elisa for cchf but ... | 2004 | 15227619 |