Block e cases appeared earlier in the outbreak and showed a point - source type of distribution . cases in other blocks which appeared 3 days later were more evenly spread out in time E座个案倾向在爆发初期发生，并呈现点源分布模式，其馀各座楼宇个案的发病时间则在3日后，而且分布得较为平均。
2.
Block e cases appeared earlier in the outbreak and showed a point - source type of distribution . cases in other blocks which appeared 3 days later were more evenly spread out in time E座个案倾向在爆发初期发生，并呈现点源分布模式，其馀各座楼宇个案的发病时间则在3日后，而且分布得较为平均。
