An outbreak of highly contagious norovirus is spreading across south-east Queensland, with 130 cases now confirmed.

The West Moreton Hospital and Health Service has identified 105 patients and staff around Ipswich and Boonah who have contracted the illness.

The bug is a form of gastroenteritis and causes vomiting and diarrhoea.

The largest outbreak is at an Ipswich nursing home, where 55 patients and 14 staff have been affected.

Elsewhere, 11 patients and 11 staff at the Ipswich Hospital have fallen ill, while at the Boonah Health Service one patient and 13 staff are sick.

On the Sunshine Coast, 25 patients in three wards at two hospitals remain quarantined.

There is no antiviral medicine for norovirus and symptoms can last for up to three days.