There is another outbreak of the highly contagious norovirus at Christchurch Hospital.

Around 20 cases of the tummy bug were recorded at Christchurch and Princess Margaret Hospital in June. Christchurch Hospital is again recording numbers of people coming in with the virus and a ward was closed over the weekend because of the infection. Spokeswoman Michelle Hider says about seven patients and 10 staff were affected.

Norovirus is characterised by its rapid onset when exposed to an infected person, food or environment, but illness lasts only about 24 hours. Symptoms include diarrhoea, vomiting, stomach cramps, fever and headaches.