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So many measles cases in southern Alberta, health authority issues standing advisory | Globalnews.ca

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The Alberta Health Services ( AHS ) order is effective immediately and until further notice for the southeastern section of Alberta that includes the cities of Lethbridge and Medicine Hat .

As of Friday afternoon , there were 408 lab-confirmed cases of measles in that region — a jump of 19 patients from Thursday .

The risk of being exposed to measles is significantly higher in the south zone than elsewhere in the province.

Measles is one of the most contagious viruses on the planet, with an R number of 12 to 18 .

One infected person can spread it to up to 18 others in an unvaccinated population.

The measles vaccine is highly effective at preventing infection and complications, and is free to get in Alberta .