health

Older children, adolescents, and adults usually recover from whooping
cough in five to six weeks without any lasting effects. Infants who have
not been immunized against whooping cough and older adults with heart
problems or lung disease are at greatest risk of developing pneumonia or
other complications of whooping cough. About two-thirds of infants
who develop whooping cough will need hospital treatment; the average
length of stay for a baby with whooping cough in 2004 was seven days.
Of the deaths caused by whooping cough in the United States in the
early 2000s, 99 percent were in infants.