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More than 30,000 people in the UK were infected with HIV and Hepatitis C after being given contaminated blood products during the 1970s and 1980s.
A public inquiry into what has been called the biggest treatment disaster in NHS history will announce its findings in May.
Victims are campaigning for compensation.
Who was affected by the infected blood scandal and how many patients were involved?
Two main groups of NHS patients were caught up in the scandal.
People with haemophilia A have a shortage of a clotting agent known as Factor VIII. People with haemophilia B don’t have enough Factor IX.
In the 1970s, a new treatment was developed to replace the missing clotting agents, made from donated human blood plasma.
But whole batches of the replacement Factor VIII and IX products were contaminated with deadly viruses.
The infected blood inquiry estimates that 1,250 people with bleeding disorders in the UK developed both HIV and hepatitis C as a result, including 380 children.
Around two-thirds later died of Aids-related illnesses. Some of those infected unintentionally gave HIV to their partners.
Another 2,400 to 5,000 people developed Hepatitis C on its own, which can cause cirrhosis and liver cancer.
Calculating the exact number of people infected with Hepatitis C is difficult, partly because it can take decades for symptoms to appear.
Colin Smith, who died aged seven, was one of 380 children now thought to have been infected with HIV through contaminated blood products.
A second group of patients were given a contaminated blood transfusion after childbirth, surgery or other medical treatment between 1970 and 1991.
The inquiry estimates between 80 and 100 were infected with HIV, and about 27,000 with Hepatitis C.
In total, it’s thought about 2,900 people have died as a result of the scandal.
Why did the infected blood scandal happen?
In the 1970s, the UK was struggling to meet the demand for blood-clotting treatments, so imported supplies from the US.
But much of the blood was bought from high-risk donors such as prison inmates and drug-users.
Factor VIII was made by pooling plasma from tens of thousands of donors.
If just one was carrying a virus, the entire batch could be contaminated.
UK blood donations were not routinely screened for hepatitis C until 1991, 18 months after the virus was first identified in a laboratory.
Jackie Britton, from Portsmouth, was infected with hepatitis C through a blood transfusion after the birth of her daughter in 1983.
What did the authorities know about infected blood?
By the mid-1970s, there were repeated warnings that imported US Factor VIII carried a greater risk of viral infection.
But attempts to make the UK more self-sufficient in blood products in the following years failed, so the NHS continued to use foreign supplies.
Campaigners say haemophiliacs could have been offered an alternative treatment called Cryoprecipitate. This was less effective and harder to administer, but was made from the blood plasma of a single donor, lowering the infection risk.
By April 1985, all Factor VIII products were heat-treated to kill the HIV virus.
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When was the infected blood inquiry set up and when will it report?
The UK-wide infected blood inquiry was announced in 2017 after years of campaigning by victims.
It was led by former judge Sir Brian Langstaff, and took evidence between 2019 and 2023.
It had been expected in autumn 2023, but Sir Brian said more time was needed to prepare “a report of this gravity”.
Exact numbers are difficult to establish, but the Haemophilia Society believes 650 people infected with contaminated blood products, or their bereaved partners, have died since the inquiry was announced.
Who gave evidence to the inquiry?
One of the first to take the stand was Derek Martindale, who has haemophilia. He was diagnosed with HIV and given a year to live in 1985, aged 23. He survived but his brother – who was also infected with HIV – did not.
Will victims of the infected blood scandal get compensation?
Those infected have received annual financial support from the government, but a final compensation deal has not been agreed.
In late 2022, following advice from the inquiry, the government made interim payments of £100,000 each to around 4,000 surviving victims and some bereaved partners.
He also recommended a final compensation scheme be set up, with the total cost likely to run into billions.
What happened in other countries which were affected by inflected blood?
Many other countries were affected by the same scandal, although some – including Finland – were self-sufficient in Factor VIII, which minimised HIV infections.
In the US, companies that supplied infected products have paid out millions of dollars in out-of-court settlements.
Politicians and drug companies have been convicted of negligence in other countries, including France and Japan.
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