What triggered the quarantine of 30 students at a Massachusetts school?

The quarantine of 30 students at a Massachusetts school was triggered because a student attended school while infected with COVID-19. This scenario highlights the importance of monitoring health symptoms and adhering to public health guidelines during a pandemic. When individuals who are contagious attend school, they pose a risk of spreading the virus to others, leading authorities to take precautionary measures such as quarantining those who may have come in close contact with the infected individual. This practice is a key element in controlling outbreaks and ensuring the safety of the wider school community.

In contrast, the presence of a teacher testing positive for COVID-19 and a flu outbreak among staff could also lead to quarantining, but it is the direct action of a student attending school while infected that specifically triggered this quarantine in this case. The option regarding a power loss due to a storm does not relate to health and safety concerns regarding infectious diseases, making it irrelevant to the situation.