Meanwhile, 10 cases were reported in the mid coast council area overnight – several are children.
With regional travel opening to Sydneysiders on Monday, health authorities fear the situation could escalate.
“With crowds of people likely to be arriving very soon it’s very important we make sure we keep in place those measures that have kept us safe,” Public Health Controller Dr David Durrheim said.
Great Lakes College’s Forster campus is among the latest sites to be closed for cleaning.
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