title: Waterborne outbreaks in the Nordic countries, 1998 to 2012.
abstract: A total of 175 waterborne outbreaks affecting 85,995 individuals were notified to the national outbreak surveillance systems in Denmark, Finland and Norway from 1998 to 2012, and in Sweden from 1998 to 2011. Between 4 and 18 outbreaks were reported each year during this period. Outbreaks occurred throughout the countries in all seasons, but were most common (n = 75/169, 44%) between June and August. Viruses belonging to the Caliciviridae family and Campylobacter were the pathogens most frequently involved, comprising n = 51 (41%) and n = 36 (29%) of all 123 outbreaks with known aetiology respectively. Although only a few outbreaks were caused by parasites (Giardia and/or Cryptosporidium), they accounted for the largest outbreaks reported during the study period, affecting up to 53,000 persons. Most outbreaks, 124 (76%) of those with a known water source (n = 163) were linked to groundwater. A large proportion of the outbreaks (n = 130/170, 76%) affected a small number of people (less than 100 per outbreak) and were linked to single-household water supplies. However, in 11 (6%) of the outbreaks, more than 1,000 people became ill. Although outbreaks of this size are rare, they highlight the need for increased awareness, particularly of parasites, correct water treatment regimens, and vigilant management and maintenance of the water supply and distribution systems.
authors.affiliation: Department of Infectious Disease Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.
authors.forename: B
authors.initials: B
authors.lastname: Guzman-Herrador
authors.forename: A
authors.initials: A
authors.lastname: Carlander
authors.forename: S
authors.initials: S
authors.lastname: Ethelberg
authors.forename: B
authors.initials: B
authors.lastname: Freiesleben de Blasio
authors.forename: M
authors.initials: M
authors.lastname: Kuusi
authors.forename: V
authors.initials: V
authors.lastname: Lund
authors.forename: M
authors.initials: M
authors.lastname: Löfdahl
authors.forename: E
authors.initials: E
authors.lastname: MacDonald
authors.forename: G
authors.initials: G
authors.lastname: Nichols
authors.forename: C
authors.initials: C
authors.lastname: Schönning
authors.forename: B
authors.initials: B
authors.lastname: Sudre
authors.forename: L
authors.initials: L
authors.lastname: Trönnberg
authors.forename: L
authors.initials: L
authors.lastname: Vold
authors.forename: J C
authors.initials: JC
authors.lastname: Semenza
authors.forename: K
authors.initials: K
authors.lastname: Nygård
mesh_terms: D000818:Animals; D002139:Caliciviridae / Q000302:isolation & purification; D017250:Caliciviridae Infections / Q000453:epidemiology; D002169:Campylobacter Infections / Q000453:epidemiology; D016123:Campylobacter jejuni / Q000302:isolation & purification; D003457:Cryptosporidiosis / Q000453:epidemiology; D003458:Cryptosporidium / Q000302:isolation & purification; D004196:Disease Outbreaks; D005872:Giardia / Q000302:isolation & purification; D005873:Giardiasis / Q000453:epidemiology; D006801:Humans; D011159:Population Surveillance; D012537:Scandinavian and Nordic Countries / Q000453:epidemiology; D013551:Swimming Pools; D014871:Water Microbiology; D014876:Water Pollution; D014881:Water Supply