We were just lucky that during that period, the weather was cold and low temperatures prevented bacteria from spreading.

bacteria 是 bacterium 的复数形式，指"细菌"，这些微小的单细胞生物有些会导致疾病，有些对人体有益。bacteria 来自希腊语 bakterion（小棍子），因为早期观察到的细菌多呈杆状。