Cases have been reported at Barnes Wallis Academy, in Tattershall; St Hugh’s School, in Woodhall Spa; St Lawrence School, in Horncastle and Mrs Mary King’s Primary School, in Martin.
Andy Fox, consultant in public health, said: “We’ve had 22 new contacts from schools in the past seven days because of a pupil or staff member testing positive for coronavirus.
“The current rate of incidence in school age children in Lincolnshire is 140 cases per 100,000 over seven days, which is much lower than the rate of 249 cases per 100,000 for all ages.
“All schools are taking action to limit the potential spread of the virus, with some pupils and staff self-isolating as a precaution where necessary.
“The majority of schools remain fully open, and those affected are working really well to limit both the risk of the virus spreading and the impact on the pupils’ education.”