Table 1. Number of residents colonised with extended-spectrum beta-lactamase-producing Escherichia coli at various study points in a long-term care facility, the Netherlands, March 2013 to April 2014 (n=296).
Organism category | Residents colonised at start of the survey (number positive during entire surveya) | Residents with colonisation acquired during study period (number with presumed in-ward transmission) | Residents colonised when admitted during the study period | Total number colonised at any point |
---|---|---|---|---|
ESBL-ST131b | 24 (10) | 14 (12) | 3 | 41 |
Other ESBL-ECc | 11 (1) | 17 (10) | 5 | 33 |
Total | 35 (11) | 29d (22) | 8 | 69d,e |
EC: Escherichia coli; ESBL: extended-spectrum beta-lactamase.
a Only residents who remained in the facility for the entire study period could be positive during the entire survey; this in contrast to residents who were lost to follow-up.
b ESBL-ST131: ESBL-producing E. coli isolates belonging to sequence type ST131.
c Other ESBL-EC: ESBL-producing E. coli isolates not belonging to ST131.
d Two residents acquired both an ESBL-ST131 and a non-ST131 ESBL-EC.
e Three residents were positive with ESBL-ST131 at the start of the survey, and acquired a non-ST131 ESBL-EC later.