Volume 13, Number 12—December 2007
Escherichia coli O157:H7 in Feral Swine near Spinach Fields and Cattle, Central California Coast1
|Sample type||No. tested||No. positive (%)||No. matches*|
|Cattle feces||77||26 (33.8)||15|
|Cattle water trough||10||0||NA|
|Compost (chicken pellets)†||1||0||NA|
|Colonic feces||40||2 (5)||2|
|Feces from ground||47||11 (23.4)||6|
|Other animal specimens‡||26||0||NA|
|Surface water§||79||3 (3.8)||2|
*No. samples indistinguishable from the major spinach-related outbreak strain by pulsed-field gel electrophoresis (XbaI-BlnI PulseNet profile EXHX01.0124-EXHA26.0015). NA, not applicable.
†Commercial, heat-treated chicken manure.
‡Included feces from coyote (n = 1), deer (n = 4), dog (n = 1), horse (n = 2), sheep/goat (n = 3, composite), waterfowl (n = 2), unknown species (n = 11), and owl (n = 2).
§Surface water (rivers, streams, ponds) was sampled by collection of 100-mL grab samples or placement of a modified Moore swab for 4–5 d.
¶Well water was sampled from 3 wells or sprinkler heads by collection of 100-mL or 1,000-mL grab samples or by concentration of 40,000 mL to 500 mL by using ultrafiltration (7).
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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.