for Cruise Research
centre for research and for
"Influenza in travellers to Alaska,
the Yukon Territory, and on west coast cruise
ships, summer of 1999," Canada
Communicable Disease Report, 1999,
outbreak of influenza A is reported among tourists who travelled to Alaska,
USA, and the Yukon Territory, Canada, on 7
separate week-long cruises between 22 May and 28 June 1999, with
reports of 428
cases of acute respiratory illness (ARI) being received by 29 June. Of
persons for whom dates of illness onset were known, 187 (48%) had onset
or within 48 h of boarding a cruise ship, which suggested that
occurred during a preceding land-based tour. Incidence of ARI was 3.8%
10110 passengers) and the ARI attack rate was 5.5 per 1000 passenger
(34%) of the ARI cases met the criteria for influenza-like illness
Four travellers were hospitalized for pneumonia.
104 cases of ARI were reported among tourism workers. Nine influenza A
isolates from tourists in Alaska were taken in the last half of June;
ones had been reported as of 15 July. 13 influenza A isolates were
taken from the whole population of the Yukon Territory,
6 of them reported in the week before 15 July.
No reports of influenza A among the resident population of British
Columbia were received, however, 2 influenza A isolates were reported
from cruise ship
passengers arriving in Vancouver.
All isolates were found to be A/Sydney/5/97 (H3N2)-like.
As of 15 July, no increases in ILI or ARI had
been found in the general populations of Alaska,
British Columbia or the Yukon