Most of the 185 million people chronically infected with the liver disease worldwide do not know they have it due to lack of screening, and many of those who do cannot access treatment due to the high cost, the UN agency said.
Some 350,000 people die of hepatitis C-related liver diseases annually, and as many as four million people become infected each year, according to the WHO, which today released its first-ever guidelines on fighting the disease.
No vaccine exists for the disease, but new antiviral treatments like Gilead Sciences' Sofosbuvir, recently approved in the United States and the European Union, have been shown to cure more than 90 per cent of those treated, up from 50 to 60 per cent for the previous generation of drugs.
But with a price tag of USD 84,000 for a 12-week treatment of Sofosbuvir in the United States - or about USD 1,000 a tablet - few can afford it, WHO expert Peter Beyer said.
"We want to benefit from the experience we have with HIV," he said, noting that the cost of drugs used to treat the virus that leads to AIDS had been pushed down from around USD 10,000 to USD 100 per person per year.
However, hepatitis C has a much lower profile in most countries, making it difficult to convince governments to address the disease.
Egypt has the world's highest infection rate of hepatitis C at more than 10 per cent of the population because syringes are routinely re-used, according to WHO.
