There are now 30 cases of measles in the area covered by Wellington-Dufferin-Guelph Public Health and officials say there is now evidence the virus is spreading in schools.

"Initially when measles was circulating, and we had cases in our area, they were in communities that didn't have a lot of interaction. But now we have some children who are attending public schools who've come down with measles and now we have a lot more exposures and a lot more individuals that we're following up on," said D…