Western Australians are being asked to be alert to the risk of measles following a confirmed measles case in a person who visited several shopping venues in Perth last week.

The Department of Health has identified a toxic algal bloom in the Swan and Canning Rivers and warns people not to eat fish, crabs or shellfish collected from either of these rivers.

Western Australians are being asked to be alert to the risk of measles following a confirmed measles case in a person who visited two public venues in Perth last week.