A Scottish health board has claimed to be the first region in the world to effectively eliminate hepatitis C.
NHS Tayside developed a pioneering approach to treating the blood borne virus in 2012, which targeted injecting drug users.
The health board said around 90% of infections occur through sharing needles.
Last year, the Scottish government unveiled plans to eradicate hepatitis C by 2024.
NHS Tayside says it has reached that target four years ahead of schedule.
An estimated 21,000 people across the country live with the chronic viral infection which causes progressive damage to the liver.
Standard treatments focus on people who have stopped using drugs or who are accessing help services.
The NHS Tayside project, developed in collaboration with the University of Dundee, focuses on people who inject drugs without waiting until they go on to recovery programmes or stop using.
This prevents them passing the virus on to others, helping limit the spread.
Since testing began, the health board has diagnosed 1,970 people and treated over 1,800 - more than 90% of the estimated prevalence of the virus.
It met the World Health Organisation's 2030 target for reducing prevalence of hepatitis C 11 years early last year and has now hit another milestone.
Lorna Birse-Stewart, chairwoman of Tayside NHS Board, said it was "the first region in the world to effectively eliminate the virus".
She added: "It is testament to the work of the teams involved and, as a board, we are very proud of them."
Consultant hepatologist and gastroenterologist Prof John Dillon said the disease consumes a significant amount of NHS resources.
And he said the work challenged previous thinking that the lives of injecting drug users are too chaotic to allow for the sort of sustained treatment that hepatitis C needs to achieve a cure.
Very early stage
Prof Dillon added: "However, our view was that with the right approach, supported with appropriate resources, we could tackle what is a very significant problem and reduce the rates of hepatitis C infection.
"If you can offer treatment at a very early stage, while people who are infected are still actively injecting, when they have contact with other people who inject and share equipment with other people, their chances of transmission disappear because they're not infected any more."
He said from a single project in a Dundee needle exchange it expanded to multiple research projects and, eventually, led to a "brave" overhaul of services.
Testing and a treatment involving taking a combination of drugs daily for eight weeks is now offered in nurse-led community clinics, as well as in more than 60 community pharmacies, prisons and drug treatment services across Tayside.
Scotland's Public Health Minister Joe FitzPatrick said: "NHS Tayside should be congratulated and recognised for this achievement.
"The Scottish government remains committed to the elimination of hepatitis C in Scotland by 2024, and we will now work closely with NHS Tayside to understand how their achievement can be replicated in other regions across Scotland."