Story highlights Health ministry announces three new cases

All three are undergoing care at an Ebola treatment center in Monrovia

(CNN) Two months after Liberia was declared free of Ebola, three confirmed cases of the deadly disease have emerged in the West African nation.

The nation's health ministry said a new case was confirmed Thursday, when blood samples from a patient admitted in a hospital the same week tested positive.

Two other high-risk contacts also tested positive, and all three are undergoing care at an Ebola treatment center in the capital of Monrovia, the health ministry said in a statement.

More than 40 contacts are being monitored, said Margaret Ann Harris, a spokeswoman for the World Health Organization.

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