Time interval between inoculation of infection to maximum infectivity is -

An infection becomes apparent only after a ceain incubation period which is defined as the time interval between invasion by an epidemiological agent and the appearance of first sign or symptoms. During incubation period the infectious agent undergoes multiplication in the host Incubation period is of fundamental impoance in epidemiological study tracing the source of infection and contacts Period of surveillance Immunization Identifying point source or propagated epidemics Prognosis (refer pgno:100 park 23rd edition)