CAD and bacterial urinary tract infection: To examine the effect of the urinary tract environment on K. pneumoniae mucoidy and CPS production, five strains were selected: two hypervirulent laboratory strains, KPPR1 (rifampin-resistant ATCC 43816 derivative) and NTUH-K2044, and three classical strains recently isolated from clinical UTI cases, 616, 714, and 1346 (27, –, 29).