Listeriosis Outbreaks in British Columbia, Canada, Caused by Soft Ripened Cheese Contaminated from Environmental Sources

Table 3

Listeria spp. detailed results from investigations.

Sample description	Listeria spp.	Matched to cheese L.m. strain?
Outbreak A samples
Brevibacterium culture spray solution	L. monocytogenes	Yes
Penicillium mould spray solution	L. monocytogenes	Yes
Aging room shelf (where spray bottles stored)	L. monocytogenes	NT^1
Aging room—inside plastic aging containers (3 samples)	L. monocytogenes	Yes
Aging room—condensate from blower unit	L. monocytogenes	Yes
Whey trench outside	L. monocytogenes	NT
Grass beside walkway	L. monocytogenes	NT
Pig garden—poo area	L. monocytogenes	NT
Pig garden—wet bedding	L. innocua
Pig garden—compost pile	L. monocytogenes and L. innocua	NT
Pig garden—whey tank area	L. innocua
Dog run	L. monocytogenes	NT
Pig pen water	L. innocua
Pig pen dirt	L. monocytogenes	Yes
Pig pen bedding	L. monocytogenes	Yes
Chicken coop floor—dirt	L. monocytogenes	NT
Chicken run—old flooring	L. monocytogenes	NT
Chicken run walkway	L. monocytogenes	NT
Outbreak B samples
Hydrated mould culture	L. seeligeri
Finished water (UV treated/filtered from inside plant)	L. seeligeri
Cistern pipe	L. monocytogenes	Yes
Pond water	L. seeligeri
Lagoon water	L. innocua
Sewage water	L. monocytogenes	NT
Cow feces	L. innocua
Cow feed greens	L. monocytogenes	No
Water/rag in milk house	L. monocytogenes	Yes
Swallow nest	L. monocytogenes	Yes
Chicken feces	L. ivanovii
Pheasant feces	L. monocytogenes	No

NT, not tested.