Substantial increase in listeriosis, Denmark 2009.
In 2009, 97 cases of listeriosis were reported in Denmark (1.8 per 100,000), a significant rise over the previous year. The increase was seen both in cases of bacteraemia and meningitis and affected mainly people aged 70 years and older. A foodborne outbreak of eight cases was identified by pulsed-field gel electrophoresis typing. No explanation has so far been found for the marked increase in incidence. An increasing trend has been observed since 2003 and possible explanations are discussed.
Kvistholm Jensen
A
A
Department of Microbiological Surveillance and Research, Statens Serum Institut, Copenhagen, Denmark. AKV@ssi.dk
Ethelberg
S
S
Smith
B
B
Moller Nielsen
E
E
Larsson
J
J
Molbak
K
K
Christensen
J J
JJ
Kemp
M
M
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D021821:Communicable Diseases, Emerging / Q000453:epidemiology*; D003718:Denmark / Q000453:epidemiology; D004196:Disease Outbreaks / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008088:Listeriosis; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D017678:Sex Distribution; D055815:Young Adult