The majority of community members receive their water from the main municipal water source. The system is chemically treated, but not filtered. Oocyst counts up to 1600 non viable per 100 litres were identified in water samples from that source. No giardia was present. Although a malfunction was identified and corrected in a nearby sewage station, the source of the outbreak has not clearly been identified and a boil water precaution remains in place.
Health authorities continue to investigate.
Quebec The Laboratory Centre for Disease Control received 3 isolates for phagetyping from Quebec. Three persons fell ill and investigators traced the source of the infection in all of the cases to eggs originating from the same egg production farm. This farm had been involved in the PT4 outbreak which occurred during the summer of 1996. Agriculture and Public Health authorities are investigating possible sources of infection. A activity nationally although cases of influenza B infection continue to be reported from some areas.