The Department of Health has said it has "no information" on where, or in what institution, a previously undisclosed fifth vaccine trial on children here in the 1960s took place.

Campaigners have called for vaccine trials to be included in the upcoming mother and baby home inquiry, after it emerged a previously unknown fifth trial was carried out on children here in the 1960s.

A previously unknown fifth vaccine trial was carried out by Glaxo Laboratories on more than 30 young children here in the 1960s.