Source of infection o Exogenous infection: patient, carrier, diseased animal or animal carrier o Endogenous condition: most are normal flora cause infection under abnormal condition Routes of infection Transmission Respiratory Gastroenteric Airborne droplets ● Genitourinary tract Food ● closely contact Water insectbitting ● blood transfuse0m Sexual contact ● Parenteral route ● Mucous membranesSource of infection ⚫ Exogenous infection : patient, carrier, diseased animal or animal carrier. ⚫ Endogenous condition : most are normal flora, cause infection under abnormal condition. • Airborne droplets • Food • Water • Sexual contact Transmission ⚫ Respiratory ⚫ Gastroenteric ⚫ Genitourinary tract ⚫ closely contact ⚫ insect bitting ⚫ blood transfusion ⚫ Parenteral route ⚫ Mucous membranes Routes of infection