For example, in the United States, rotavirus and astrovirus infections occur during the cooler months of the year (October to April), whereas adenovirus infections occur throughout the year.

• 例如，在美国，轮状病毒和星状病毒的传染常出现在一年中较冷的月份（10月到来年四月之间)，而腺病毒传染则整年发生。