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Three hypotheses were tested: (i) <jats:italic>L.\u00a0salmonis<\/jats:italic> can acquire <jats:italic>A.\u00a0salmonicida<\/jats:italic> subsp. <jats:italic>salmonicida<\/jats:italic> via water bath exposure; (ii) <jats:italic>L.\u00a0salmonis<\/jats:italic> can acquire the bacteria via parasitizing infected Atlantic salmon, <jats:italic>Salmo salar<\/jats:italic>; and (iii) <jats:italic>L.\u00a0salmonis<\/jats:italic> can transmit the bacteria to na\u00efve Atlantic salmon via parasitism. Adult <jats:italic>L.\u00a0salmonis<\/jats:italic> exposed to varying <jats:italic>A.\u00a0salmonicida<\/jats:italic> subsp. <jats:italic>salmonicida<\/jats:italic> suspensions (10<jats:sup>1<\/jats:sup>\u201310<jats:sup>7<\/jats:sup>\u00a0cells\u00a0mL<jats:sup>\u22121<\/jats:sup>) for 1.0, 3.0 or 6.0\u00a0h acquired the bacteria externally (12.5\u2013100%) and internally (10.0\u2013100%), with higher prevalences associated with the highest concentrations and exposures. After exposure to 10<jats:sup>7<\/jats:sup>\u00a0cells\u00a0mL<jats:sup>\u22121<\/jats:sup>, viable <jats:italic>A.\u00a0salmonicida<\/jats:italic> subsp. <jats:italic>salmonicida<\/jats:italic> could be isolated from the external carapace of <jats:italic>L.\u00a0salmonis<\/jats:italic> for 120\u00a0h. <jats:italic>Lepeophtheirus salmonis<\/jats:italic> also acquired the bacteria externally and internally from parasitizing infected fish. Bacterial transmission was observed only when <jats:italic>L.\u00a0salmonis<\/jats:italic> had acquired the pathogen internally via feeding on \u2018donor fish\u2019 and then by parasitizing smaller (&lt;50\u00a0g) \u2018naive\u2019 fish. Under specific experimental conditions, <jats:italic>L.\u00a0salmonis<\/jats:italic> can transfer <jats:italic>A.\u00a0salmonicida<\/jats:italic> subsp. <jats:italic>salmonicida<\/jats:italic> via parasitism; however, its role as a mechanical or biological vector was not defined.<\/jats:p>","DOI":"10.1111\/jfd.12449","type":"journal-article","created":{"date-parts":[[2016,2,6]],"date-time":"2016-02-06T03:06:46Z","timestamp":1454728006000},"page":"1165-1178","source":"Crossref","is-referenced-by-count":24,"title":["Investigations on the role of the salmon louse, <i>Lepeophtheirus salmonis<\/i> (Caligidae), as a vector in the transmission of <i>Aeromonas salmonicida<\/i> subsp. <i>salmonicida<\/i>"],"prefix":"10.1111","volume":"39","author":[{"given":"C W","family":"Novak","sequence":"first","affiliation":[{"name":"Land &amp; Food Systems University of British Columbia Vancouver BC Canada"},{"name":"Fisheries &amp; Aquaculture Department Vancouver Island University Nanaimo BC 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