Protection by pertussis vaccine. Little cause for concern.

It was estimated from a survey of 418 children aged three weeks to twelve years with bacteriologically confirmed whooping-cough that about 95% of vaccinated children are protected by current vaccine. Protection could be increased even further by the greater use of adsorbed rather than plain vaccine and by closer adherence to a vaccination schedule. The lower incidence of infection, resulting from widespread acceptance of this highly effective vaccine, would also greatly reduce the exposure of infants who are too young to be immunished themselves; and eradication ow whooping-cough would be in sight.