Delaying first vaccination has a knock-on effect

Study shows large families are at particular risk of extended delays
Jocelyn Wright
Crying baby

Timely vaccination with the first infant diphtheria–tetanus–pertussis (DTPa) shot is key to children keeping to the schedule, leading immunisation specialists say.

The researchers have found that each week the initial DTPa vaccination is delayed in infants doubles the risk that subsequent vaccines will be late.