Officials say the student concerned had been isolating before the test result was confirmed and no-one else is affected.
Officials say they have to act now to secure the future of the organisation that stages the popular event.
More than 20 other children are now isolating as the head of the school's trust says he is worried about the impact of the pandemic on staff.
Affected pupils won't return to school for another week after half-term.
NHS England figures suggest more patients are being treated for Covid-19 in Lynn than at either of Norfolk's other main hospitals.
Borrowing limits will be more than halved from next week, though officials say people can still read more, for longer, than before lockdown.
Officials have urged council leaders to take on the provision, though district officials say they have "no plans" to do so.
Dozens of vulnerable families have been helped, but it is feared many more are in need of support.
Around 140 staff members have already tested positive, public health officials say.
The park's staff and customers have raised huge sums for good causes over more than 20 years.
Two students who headed off to university this autumn have shared their experiences of student life during the pandemic.
A North Lynn community hub will be opening its doors tomorrow to support families in need.
Campaigners say there is 'room for hope', but urgent action is still needed.
Police have appealed for information following a disturbance this week.
Developers are proposing changes to a scheme which was given the go-ahead earlier this year.
The annual appeal is getting underway this weekend, but is likely to look very different because of the coronavirus pandemic.
Police have launched an investigation and have appealed for anyone who may have seen what happened to come forward.
Bosses say the move is necessary for safety reasons and they are looking at ways in which supporters can help remotely.
Coastguard and Lifeboat personnel were called out to search for the animal.
Emergency crews are still at the scene following the incident.