 In developed countries, where the disease rarely occurs, it is recommended to seek the advice of a specialist in infectious disease when diagnosed.Mortality is often thought to be due to subsequent infections due to the weakened immune symptoms and opportunistic pathogen invasion, or consequences of malnutrition due to weight loss in children.In a study focusing on pediatric and gestational effects of the disease, mortality rates for pregnant women with the acute phase were estimated at 40% and rates of spontaneous abortion in another 40%.