TABLE 3.

Suspected outbreaks detected by the 2SD and MI algorithm tools during 1999

Mo	Organism	DNA typing resulta	Infection control ini- tiated inves- tigation	Flagged by the:
				2SD method	MI method
Jan	Clinical VREfaecium	Clonal	No	Yes	Yes
Feb	S. maltophilia	Clonal	Yes	No	No
Feb	C. freundii group	Not tested	No	Yes	No
Mar	S. marcescens	Clonal	Yes	No	No
Mar	E. coli	Not clonal	Yes	No	No
Mar	E. cloacae	Not clonal	Yes	No	No
Mar	C. difficile	Not tested	No	No	Yes
Mar	H. influenzae	Not tested	No	No	Yes
Apr	E. aerogenes	Not tested	No	No	Yes
May	C. diversus	Not tested	No	No	Yes
Jun	MSSA	Not clonal	Yes	No	No
Jun	A. anitratus/baumannii	Not tested	No	No	Yes
Jun	C. difficile	Not tested	No	No	Yes
Jun	K. pneumoniae	Not tested	No	No	Yes
Jun	MRSA	Not tested	No	No	Yes
Jun	S. marcescens	Not tested	No	No	Yes
Jul	H. influenzae	Not tested	No	No	Yes
Jul	K. pneumoniae	Not tested	No	No	Yes
Jul	P. mirabilis	Not tested	No	No	Yes
Aug	S. maltophilia	Not clonal	Yes	No	Yes
Aug	K. pneumoniae	Not clonal	Yes	No	No
Aug	Clinical VREfaecalis	Not tested	No	Yes	Yes
Aug	E. aerogenes	Not tested	No	Yes	No
Aug	MRSA	Not tested	No	Yes	No
Aug	Total VREfaecalis	Not tested	No	Yes	Yes
Sep	S. maltophilia	Clonal	Yes	Yes	Yes
Sep	P. aeruginosa	Clonal	Yes	No	No
Sep	Clinical VREfaecium	Not tested	No	Yes	Yes
Sep	A. anitratus/baumannii	Not tested	No	No	Yes
Sep	C. diversus	Not tested	No	No	Yes
Sep	S. pneumoniae	Not tested	No	No	Yes
Oct	Clinical VREfaecalis	Not tested	No	Yes	Yes
Oct	E. faecalis	Not tested	No	Yes	Yes
Oct	Total VREfaecalis	Not tested	No	Yes	No
Oct	C. difficile	Not tested	No	No	Yes
Oct	H. influenzae	Not tested	No	No	Yes
Nov	Total VREfaecium	Clonal	No	No	Yes
Nov	C. freundii group	Not clonal	No	Yes	Yes
Nov	S. marcescens	Not tested	No	No	Yes
Dec	Total VREfaecium	Clonal	No	Yes	Yes
Dec	C. difficile	Not tested	No	Yes	No
Dec	Clinical VREfaecium	Not tested	No	Yes	Yes
Total				15	30

^aA result indicating “clonal” or “not clonal” indicates 1 of the 13 potential outbreaks that was investigated by molecular typing.