<prompt> Stage in which disease is easily recognized and high titre of antibodies are found:Prodromal stage.FastigiumDefervescence stageConvalescence  <response>: Incubation: This period elapsed from invasion of the tissue by pathogens and appearance of clinical featuresProdromal stages: Signs and symptoms are not specific for disease. Antibody titre is risingFastigium: Disease is easily recognized. In this phase high titres Peak of antibodies are foundDefervescence stage: Body defense mechanisms dominate and patient feels betterConvalescence recovery stage: In convalescence the antibody titres decrease. The patients may act as carrier also 