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Aims  Listeriosis is a frequent silage‐associated disease in ruminants. The slugs   A rion vulgaris  are invaders in gardens, vegetable crops and meadows for silage production. Field and laboratory studies were conducted to clarify whether slugs could host   L isteria monocytogenes  and thereby constitute a threat to animal feed safety.    Methods and Results  Selective culture of  L. monocytogenes  from 79 pooled slug samples (710 slugs) resulted in 43% positive, 16% with mean  L. monocytogenes  values of 405  CFU  g −1  slug tissues. Of 62 individual slugs cultured, 11% also tested positive from surface/mucus. Multilocus sequence typing analysis of 36 isolates from different slug pools identified 20 sequence types belonging to  L. monocytogenes  lineages I and  II . Slugs fed ≅4·0 × 10 5   CFU  L. monocytogenes , excreted viable  L. monocytogenes  in faeces for up to 22 days. Excretion of  L. monocytogenes  decreased with time, although there were indications of a short enrichment period during the first 24 h.    Conclusions   Arion vulgaris  may act as a vector for  L. monocytogenes .    Significance and Impact of the Study  Highly slug‐contaminated grass silage may pose a potential threat to animal feed safety.

Invading slugs ( A rion vulgaris) can be vectors for L isteria monocytogenes