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Volume 13, Number 12—December 2007


Escherichia coli O157:H7 in Feral Swine near Spinach Fields and Cattle, Central California Coast1

Michele T. Jay*Comments to Author , Michael Cooley‡, Diana Carychao‡, Gerald W. Wiscomb§, Richard A. Sweitzer¶, Leta Crawford-Miksza*, Jeff A. Farrar#, David K. Lau**, Janice O’Connell*, Anne Millington#, Roderick V. Asmundson**, Edward R. Atwill, and Robert E. Mandrell‡
Author affiliations: *California Department of Public Health, Richmond, California, USA; †University of California, Davis, California, USA; ‡US Department of Agriculture, Albany, California, USA; §US Department of Agriculture, Sacramento, California, USA; ¶University of North Dakota, Grand Forks, North Dakota, USA; #California Department of Public Health, Sacramento, California, USA; **US Food and Drug Administration, Alameda, California, USA;

Main Article

Table 2

Unique alphanumeric MLVA types of Escherichia coli O157:H7 isolated from environmental samples collected at ranch A and an upstream watershed, California, September–November 2006*

Sample type No. samples No. isolates MLVA type
Reference (human stool, bagged spinach) NA NA E
Cattle feces 26 34 A, C, E, F, I, J, L, M, P, Q, R, S, T, W, X, Z
Feral swine feces 11 14 A, B, C, E, L, O, P, X, 5, 6
Feral swine colonic feces (necropsy) 2 10 A, C, D, G, H, K, L, U, V, Y
Sediment (river) 2 8 A, C, L, M, N, W, 3
Soil (cattle pasture) 1 1 A
Surface water 3 6 A, C, L, P, 4
Surface water Moore swab† 2 3 1, 2

*MLVA, multilocus variable number tandem repeat analysis; NA, not applicable. Samples indistinguishable from the major spinach-related outbreak strain by pulsed-field gel electrophoresis (XbaI-BlnI PulseNet profile EXHX01.0124-EXHA26.0015) are shown in boldface.
†Isolates collected from surface water (river) ≈32 km upstream of ranch A.

Main Article

1This work was presented in part as a poster at the 107th General Meeting of the American Society for Microbiology, Toronto, Ontario, Canada, May 24, 2007.