The state’s top health official says swine flu is “quite widespread” in southern and central Maine. Dr. Dora Mills of the Maine Center for Disease Control and Prevention said Thursday that despite delays in delivery of H1N1 vaccine, there’s been an “unprecedented effort” to vaccinate children in schools. Mills says 12,000 schoolchildren have been vaccinated this week, a number she called “extraordinary.” With swine flu widespread in parts of the state, Mills said the state will have received only 99,000 doses of vaccine by the end of Friday. She said that’s enough to give to only one out of every seven Mainers who are in the high-risk category. Mills said children, who are all high-risk, are a priority for getting the vaccine.