no. According to the inquiry of JIAOZHOU official website, Qingdao Jiaozhou School did not use prepared dishes in this incident. The ingredients in Qingdao school canteen were all purchased locally and passed strict inspection and screening. The school canteen paid attention to the freshness and nutrition of ingredients and adopted advanced cooking techniques to ensure the quality and safety of food. School-prepared dishes refer to dishes pre-made by catering enterprises and delivered to schools.