The “Hep C” virus, which is transmitted through bodily fluids and displays few symptoms, is an “increasing problem” for gay men.

The Hepatitis C Trust estimate that nine out of ten people infected with Hepatitis C don’t even know that they are infected with the disease.

Unlike Hepatitis A and B, there is currently no vaccine for Hepatitis C.

The disease is transmitted via blood to blood contact including sex, tattooing, sharing cocaine straws or notes and even sharing an infected person’s razor or toothbrush.

Will Nutland, Head of Health Promotion at Terrence Higgins Trust, said:

“Hepatitis C is an increasing problem for gay men.

“It can be the most damaging type of Hepatitis and even though it can have no symptoms for many years, in the longer term it can also cause cirrhosis of the liver, liver cancer and death.

“Until recently Hepatitis C was thought only to be transmitted through blood, and rarely through sex.

“However, many more gay men have been diagnosed with the disease recently and it is now thought that unprotected anal sex and fisting also transmit the virus.”

There is no preventative vaccine for Hepatitis C infection, but some treatments can be effective in around 50% of cases.

Dame Anita Roddick, who built a retail empire while taking an ethical approach to business, revealed before her death last year that she contracted the Hepatitis C virus and suffered liver damage.

A blood transfusion she received in 1971 while giving birth to her youngest child was the source of the infection.

Roddick founded The Body Shop in 1976 and sold her stake in the 2000-store chain to cosmetics giant L’Oreal for £652m in 2006.

In September 2007 she died as a result of “a major brain haemorrhage” at the age of 64.

Dame Anita was critical of the British government’s approach, and urged people to get tested:

“I want to blow the whistle on the fact that Hep C must be taken seriously as a public health challenge and must get the attention and resources that it needs,” she wrote on her  blog.

“Hep C has been called a ‘silent killer’ because you can go for years with no symptoms. It is also a silent killer because it’s just not being diagnosed and dealt with in an effective way.

“Nine out of ten of us who have Hep C simply don’t know they’ve got it. The Government in this country doesn’t seem to have had a very vigorous response to Hep C.

“If you look at somewhere like France, half the people with the virus have already been diagnosed. But in this country we’re way behind; only 1 in 10 people with Hepatitis C have been diagnosed.”

For more information visit the Hepatits C Trust website.