What is the term for the residual effect after the acute phase of an illness or injury?

The correct term for the residual effect following the acute phase of an illness or injury is "sequela." This term is used in medical terminology to describe conditions that result from a previous disease or injury, indicating ongoing complications that can arise after the initial event has resolved. Sequelae can vary in severity and can affect different systems of the body, illustrating how an initial health issue can have lasting consequences.

The other options do not accurately refer to this concept. "Acute Effect" typically refers to immediate consequences occurring during the active phase of an illness or injury, not after it has passed. The "Chronic Phase" refers to ongoing conditions that are long-lasting and could be part of the sequela but does not specifically denote residual effects. "Secondary Condition" is a broader term that may imply related conditions that arise due to an initial health issue but does not directly define the residual effects experienced after the acute episode has ended. Thus, "sequela" precisely captures the intended meaning of ongoing effects following the initial acute phase.