TABLE 1.

Bacterial strains tested for PlyC sensitivity

Bacteria	Strain	Sourcea	PlyC activityb
Group C streptococcus organisms
S. equi subsp. equi	ATCC 9528	1	+
S. equi subsp. zooepidemicus	ATCC 700400	1	+
S. dysgalactiae subsp. equisimilis	ATCC 21597	1	+
	26RP66	2	+
Strangles clinical isolate sources
S. equi subsp. equi	Silent Erac	3	+
	Dixie Bestc	3	+
	Savy Lovelacec	3	+
	Lady Buckc	3	+
	S. Farmc,d	3	+
	CF32	3	+
	E21	3	+
	90178	3	+
	7-2761-1	4	+
	7-2862-1	4	+
	7-3807-1	4	+
	7-3807-2	4	+
	7-3807-3	4	+
	7-3807-4	4	+
	7-3807-5	4	+
	7-3807-6	4	+
	7-3807-7	4	+
S. equi subsp. zooepidemicus	6-1289-7	4	+
Representative gram-positive organisms
Streptococcus
S. sobrinus	6715	2	−
S. rattus	BHT	2	−
S. suis	7-2911-2	4	−
	7-3008-2	4	−
	7-3008-3	4	−
S. pneumoniae	DCC1494	2	−
	DCC1850	2	−
S. oralis	PK 34	2	−
S. mutans	25175	2	−
S. agalactiae	A934	2	−
Staphylococcus
S. aureus	COL	2	−
	8325	2	−
S. epidermidis	HER1292	2	−
S. hyicus	HER 1048	2	−
Other
Bacillus cereus	4342	2	−
Enterococcus faecalis	EF-24	2	−
Enterococcus faecium	EFSK16	2	−

^aSources are as follows: 1, ATCC, Manassas, VA; 2, Vincent A. Fischetti, The Rockefeller University, New York, NY; 3, John F. Timoney, Gluck Equine Research Center, University of Kentucky, Lexington, KY; 4, Randy Shirbroun, Newport Laboratories, Worthington, MN.

^bActivity: −, no change in the OD₆₀₀ value; +, a drop in the OD₆₀₀ value of >0.5 in 2 min.

^cThese S. equi subsp. equi strains are named based on the names of the horses from which they were originally isolated.

^dGiven strain labeled only as “S. Farm.”