An 11th person has been hospitalised in Auckland with typhoid and a common link has been discovered, health officials have confirmed.

Auckland Regional Public Health Service clinical director Julia Peters says the cases are all from a Pacific church community.

The health service is following up with 60 people in the group.

"It is a localised outbreak and at this stage we do not know how or when it got into Auckland," Dr Peters said on Monday.

"Knowing that the cases are connected gives us a clear direction, but this is still a serious situation and we are following up other connections."

She said some people could carry the disease for some time without passing it on and it was primarily spread through food and water.

Typhoid can be a serious illness and is potentially fatal but can be treated with antibiotics.

Good basic hand-washing was one of the best ways people could protect themselves, authorities say.

Symptoms included a high fever developing over several days, headaches, general weakness and muscle aches. Stomach pain and constipation were also common but some people would get diarrhoea.

Anyone with symptoms should see their doctor or call Healthline on 0800 611 116.