Final answer:
An email about a lice outbreak at a high school is generally sent to students, parents, guardians, and school staff to inform and guide them on preventing the spread of lice.
Step-by-step explanation:
Typically, an email about a lice outbreak at a high school would be sent to those who are part of the affected school community. Specifically, this email would likely be sent to the students, their parents or guardians, and school staff. The aim is to inform them of the situation and to outline steps to manage and prevent further spread of head lice. Importantly, it serves as a precautionary measure contributing to public health and safety within the school environment.