The pupils were all taken to Bronglais Hospital

Dominic Hamer, 13, returned home at lunchtime on Friday.

The Ysgol Gyfun Penweddig pupil suffered a severe allergic reaction to a BCG vaccine being administered to students at the school on Monday.

He was admitted to the town's Bronglais hospital and spent a night in intensive care before being transferred to a general ward.

Two other pupils, who were also treated in hospital, were discharged on Wednesday.

Another 10 students also received medical help at Bronglais after suffering "adverse effects" to the injections.

Dominic was discharged at lunchtime and he had made a full recovery Brian Thomas, Ceredigion and Mid Wales Trust

Nearly 120 pupils at the comprehensive school were being injected with the BCG vaccine, which combats tuberculosis.

Brian Thomas, head of corporate service for Ceredigion and Mid Wales Trust, said: "Dominic was discharged at lunchtime (on Friday) and he had made a full recovery.

"The other two children who spent time in hospital were discharged on Wednesday."

Ceredigion NHS Trust is also investigating and the batch of vaccine has been withdrawn.

On Wednesday, Health Minister Jane Hutt said there were no grounds for suspecting any fault with the BCG vaccine which left 13 pupils needing treatment.

Ms Hutt told assembly members at Cardiff Bay: "The National Public Health Service is investigating the circumstances and the initial indications are that there are no grounds for suspecting that there is any fault with this batch of the vaccine."

Dominic is a pupil at Ysgol Penweddig

The minister added that the vaccine batch had been used extensively without any reaction of the kind experienced at the Aberystwyth school.

She said that the Medicines and Healthcare Regulatory Agency's initial assessment also indicated that, "this is an isolated incident and there's no reason to suspect there's a problem with the vaccine."

Dominic was said to have had an anaphylactic shock, which is defined as a very sudden serious physical reaction caused by an allergy.

The trust has said it is working closely with the school to ensure that pupils and parents receive any information or support they require.

The daughter of Plaid Cymru Ceredigion MP Simon Thomas was another pupil who had a reaction to the vaccine.