A patient with cervical cancer is missed by a screening test and later diagnosed to have advanced disease. This time interval is called:

Ref: K. Park, Textbook of Preventive and Social Medicine.22nd edition. P 127: Text book of public health and community medicine. Armed Force Medical College, Pune. First edition 2009 p 136. p224Explanation:Lead time:Lead time is defined as the interval between the point a condition is detected through screening and the time it would normally have been detected due to appearance and reporting of signs and symptoms.It is the advantage gained by screeningScreening time:The time interval between the point a condition is detected through screening and final critical diagnosis by other means before usual time of diagnosis.Serial Interval: The gap in time between the onset of the primary case and the secondary case is called the '"serial interval".Generation time:It is defined as "the interval of time between receipt of infection by a host and maximal infectivity of that host"