Alberta Health Services (AHS) is warning anyone living, working or travelling in the south zone to be aware of the "significant current risk" for measles exposure.

The health authority issued a standing measles exposure advisory on Friday afternoon. It applies to all communities in the zone, which stretches from Crowsnest Pass in the west to Medicine Hat in the east, and includes Lethbridge.

AHS said the zone-wide notice replaces site-specific advisories that the health authority said "no longer …