Testing conducted in late May and early June produced four positive results, but officials determined the cases were latent and that all four had been infected prior to coming to the school.

• 在五月末六月初进行的测试查结果显示四个人呈阳性，但卫生官员推断说那几个病例都是潜在的，而且他们在去学校之前已经被感染。