ST. PAUL, Minn. (AP) — Health officials say the number of children contracting measles in the Twin Cities has climbed to seven.

The Minnesota Department of Health says the latest case involves a 7-month-old child. Three cases are children who are old enough to get vaccinated, but haven’t been. Another three involve infants who are too young for the vaccine. The health department says the outbreak probably started with an infant who returned from Kenya last month.

Public health officials are hoping free vaccination clinics will encourage families to protect their children against measles. The Star Tribune says another clinic will be held Sunday afternoon at Children’s Hospital in Minneapolis.