three different epidemic patterns of ad 7 infection can be distinguished : 1 ) the first appears during the winter among infants with median age below two years , has characteristic symptoms of high fever and pneumonia and an outcome that may be fatal : 2 ) the second appears in the fall among children with median age seven years , has characteristic symptoms of high fever , pneumonia , abdominal symptoms and meningism and an outcome that is favorable ;
C0021270
infants
C0008059
children