| presumptive summer influenza a: an outbreak on a trans-tasman cruise. | a number of recent reports from the northern hemisphere have drawn attention to the occurrence of summer outbreaks (may to august) of influenza a among cruise ship passengers and their contacts. in cases amongst passengers returning to canada from alaska, exposure appears to have occurred during the land-based alaskan tour with illness developing during the subsequent cruise. a late summer outbreak of influenza a among passengers and crew on the return leg of a 14-day sydney-new zealand-sydney c ... | 2000 | 10812749 |