Which health issue must be reported to the CDC?

The requirement to report certain health issues to the Centers for Disease Control and Prevention (CDC) is based on the potential impact these diseases can have on public health. Yellow fever is classified as a high-priority infectious disease that poses a serious risk, especially in areas where it is endemic. The CDC monitors and controls outbreaks of such diseases to protect public health and prevent widespread transmission.

In contrast, the common cold and seasonal allergies are not reported to the CDC because they are not considered serious public health threats. The common cold is a mild viral infection that mostly leads to minor illness, while seasonal allergies are typically managed through personal healthcare and do not require public health intervention. Chickenpox, although serious, has already been largely controlled through vaccination, and it is often managed at the local level rather than requiring immediate reporting to the CDC. Thus, among these choices, yellow fever stands out as the condition that necessitates reporting due to its potential for causing outbreaks and serious health issues.