Medford Public Schools to use pool testing model Chris Van Buskirk / State House News Service The Medford Public School District will start combining nasal swabs from students, teachers, and staff in group samples for PCR analysis in what is known as pool testing, local officials said, adding the move would save the city money compared to individual testing. City, school, and university officials announced the testing plans and partnership between the city and university at a press conference Feb. 11. Mayor Breanna Lungo-Koehn said Medford officially started pool testing the first week of February and since then, has only identified one positive pool out of 2,500 tests conducted.