Influenza is an acute, viral respiratory infection that causes significant morbidity and mortality among high-risk groups like pregnant women and infants. Physiological and immunological changes during pregnancy including decreased tidal volume and lung capacity, increased oxygen consumption and cardiac output, and selective suppression of T-helper-type 1 cell-mediated immunity that impairs maternal response to infection and poses pregnant women at high risk of complications and hospitalizations. The symptoms of influenza are fever, headache, chills, muscle aches, coughing, congestion, runny nose, and sore throat. Dengue fever is a viral disease caused by any of 4 closely related serotypes of Flavivirus (RNA virus). The clinical manifestations, treatment and outcome of dengue in pregnant women are similar to those of nonpregnant women.