In 1990, more than 1,100 cases of mumps were reported in Maryland. Mumps vaccine is usually given combined with measles vaccine. In 1998, there was only one case of mumps reported in Maryland. Since widespread use of the vaccine began, the incidence of pertussis has decreased 98 percent. In 1998, there were 63 cases of pertussis in Maryland.
Diphtheria can block the airway, making it impossible to breathe.
It can also cause heart problems. Three of 10 people who get tetanus die. It can cause spells of violent coughing and choking, making it hard to breathe, drink, or eat. Pertussis is most serious for babies, who can get pneumonia, have seizures, become brain damaged, or even die. About half of babies who get pertussis have to be hospitalized.