Key Facts
Twenty-two listeriosis cases were notified in 2018, the highest number since
the disease became notifiable in 2004
All cases had recognised risk factors for listeriosis, with largest increase
occurring among the elderly
No clusters of listeriosis were identified
No source was confirmed for any individual case
Referral of isolates for typing at NSSLRL enables detection of clusters and
monitoring of trends in the strains that cause listeriosis in Ireland
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