Passage: In children, gastrointestinal symptoms such as vomiting, diarrhea, and abdominal pain, (may be severe in children with influenza B)It can be difficult to distinguish between the common cold and influenza in the early stages of these infections. Influenza symptoms are a mixture of symptoms of common cold and pneumonia, body ache, headache, and fatigue. Diarrhea is not usually a symptom of influenza in adults, although it has been seen in some human cases of the H5N1 "bird flu" and can be a symptom in children. The symptoms most reliably seen in influenza are shown in the adjacent table.The specific combination of fever and cough has been found to be the best predictor; diagnostic accuracy increases with a body temperature above 38°C (100.4°F). Two decision analysis studies suggest that during local outbreaks of influenza, the prevalence will be over 70%. Even in the absence of a local outbreak, diagnosis may be justified in the elderly during the influenza season as long as the prevalence is over 15%.The United States Centers for Disease Control and Prevention (CDC) maintains an up-to-date summary of available laboratory tests. According to the CDC, rapid diagnostic tests have a sensitivity of 50–75% and specificity of 90–95% when compared with viral culture.Occasionally, influenza can cause severe illness including primary viral pneumonia or secondary bacterial pneumonia. The obvious symptom is trouble breathing. In addition, if a child (or presumably an adult) seems to be getting better and then relapses with a high fever, that is a danger sign since this relapse can be bacterial pneumonia.Sometimes, influenza may have abnormal presentations, like confusion in the elderly and a sepsis-like syndrome in the young. Encephalitis due to the flu is rare but not unheard of.

Question: what is the sensitivity of rapid diagnostic test?
50–75%