Social & Preventive Medicine Median incubation period means: A The time required for 50% of the cases to occur following exposure. B Time gap between onset of primary and secondary case C Interval between first clinical detection and final critical point D Time between exposure to a risk factor and subsequent development of clinical manifestations of a particular disease 💡 Explanation Median incubation period means: ✓ Correct Answer: A. The time required for 50% of the cases to occur following exposure.