More than 130 cases of scarlet fever have been reported so far this year in the East Midlands, sparking a warning from health bosses in the region.
The bacterial infection, which causes a distinctive pink-red rash, is rare in the UK but there has been a surge in cases over the past few weeks.
Teachers and nursery staff in Lincolnshire have now been sent letters by the county council advising them on how to spot the warning signs of the condition.
Latest figures show a decline in the number of new cases of scarlet fever being recorded weekly in the East Midlands.
275 more cases of Scarlet Fever have been notified in the East Midlands in the first 11 weeks of 2014 compared to the same time last year.
Public health officials from Derbyshire County Council are warning parents to look out for the symptoms of scarlet fever in their children.