• if after previously having Infanrix hexa or another vaccine against pertussis (whooping cough) disease, your child had any problems, especially: ♦ A high temperature (over 40°C) within 48 hours of vaccination ♦ A collapse or shock-like state within 48 hours of vaccination ♦ Persistent crying lasting 3 hours or more within 48 hours of vaccination ♦ Seizures/fits with or without a high temperature within 3 days of vaccination • if your child is suffering from an undiagnosed or progressive disease of the brain or uncontrolled epilepsy.