A school district in New Hampshire canceled school on Monday when too many staff called in sick after receiving a COVID-19 vaccine the day before, Superintendent Kathleen Murphy said in a message to parents. “Early this morning, after receiving communication from our building Principals, I made the decision to close school for the day,” Murphy said. “This decision was the result of a significant number of staff who became ill from the effects of the vaccine they received on Sunday.” “The District just did not have enough substitutes or personnel to cover classrooms and common areas,” she added. More than half of the staff at Concord School District received the one-dose Johnson & Johnson (J&J) vaccine. The rest of the staff will be vaccinated on March 28 with the announcement of which vaccine will be given two days prior. The district said that they were not able to request a …