David and Nicole Epapara with their children. Source: The Sunday Mail (Qld)

Two-year-old twin Ashley Jade Epapara had been "perfectly fine" before dying at her Upper Mt Gravatt home, on Brisbane's southside, on April 9. Parents David and Nicole are shattered by the mysterious death of their baby girl. "It's dreadful, it's a very hard time," Mr Epapara said yesterday.

National health authorities have ordered doctors to stop giving seasonal influenza vaccinations to children under five after dozens of serious reactions, including convulsions.

Ashley's death is being investigated by police and the office of the coroner. A spokesman for Brisbane coroner John Lock confirmed yesterday that a report was being prepared.

Mrs Epapara told The Sunday Mail that "tests are being carried out" on her little girl. But the young mother didn't want to comment further as she began shaking and her eyes welled with tears. Ashley's twin sister, Jaime, also received the flu jab at the same time and is believed to have been vomiting the night before her sister died.

Asked whether he or his wife thought the influenza vaccine had anything to do with their child's death, Mr Epapara said: "It's very coincidental."

More than 45 children experienced convulsions and fever, with some having to be hospitalised in intensive care after receiving the vaccine in Western Australia.

Queensland chief health officer Jeannette Young confirmed 15 children in Queensland had been recorded as having an adverse reaction to the vaccine.

Australia's chief medical officer Professor Jim Bishop said in a statement that the West Australian events were being "urgently investigated by health experts and the Therapeutic Goods Administration".

The World Health Organisation last year said a "small number of deaths" had occurred in people vaccinated for influenza, with 65 million people vaccinated globally.