HSS Block B Practice Test

Public health risk and contagiousness determine Class A versus Class B in immigration medical screening. Class A includes diseases with significant public health impact that require prompt action to prevent spread, while Class B covers conditions that are not contagious or pose less immediate risk and can be managed without blocking entry.

Active TB is contagious and requires treatment and clearance, so it fits the Class A category. Latent TB, on the other hand, is not infectious and does not by itself pose an immediate public health threat, which aligns with Class B. The other options pair conditions in ways that don’t reflect this contagiousness-based distinction, so they don’t fit as clean Class A/Class B matches.