What is a possible characteristic of a possible case?

A possible case is one that may not meet all criteria for a confirmed case but still demonstrates some clinical features that suggest the presence of a disease. These clinical features can vary widely and may include symptoms or signs that are indicative of the condition being considered. The presence of some clinical features is essential in identifying and tracking potential cases in epidemiology.

Laboratory confirmation is often required to classify a case definitively, which makes the first option not suitable for a possible case. Similarly, displaying no clinical symptoms suggests a lack of evidence for the disease, which does not align with the definition of a possible case. The characteristic of being always fatal does not apply, as many diseases can have a range of outcomes, and a possible case might not necessarily reach a fatal progression. Therefore, the correct understanding focuses on the existence of some clinical features that support the identification of a possible case, even if it lacks full confirmation or comprehensive symptom presentation.