A two-year-old US girl who needs several blood transfusions to fight cancer has spurred an global campaign to search for compatible donors.

Zainab Mughal has one of the rarest blood types in the world, which makes it difficult to treat her condition.

Campaigners say more than 1,000 people have been tested, but only three so far have the blood she needs.

Doctors say seven to 10 donors will be needed over the course of her cancer treatment.

Earlier this year Zainab was diagnosed with neuroblastoma, an aggressive and rare form of cancer that mostly affects babies and young children.

Blood transfusions will be needed for the duration of her treatment, but Zainab’s blood is “extremely rare” because it is missing an antigen – “Indian B” – that most people carry in their red blood cells, says OneBlood, a non-profit blood centre that’s spearheading the search for donors.

The only donors likely to be a match are people of exclusively Pakistani, Indian or Iranian descent, and with blood type O or A, OneBlood says.

But even within these countries, less than 4% of the population will be missing the Indian B antigen.

Zainab’s body will reject any blood which doesn’t match all the requirements.

“This is so rare that honestly this the first time I’ve seen it in the 20 years I’ve been doing this,” said Frieda Bright, a laboratory manager with OneBlood.

OneBlood is working with other blood banks and the American Rare Donor Program (ARDP), a program that finds donors of rare types of blood around the world.

Two matching donors have been found in the US and one other in the UK.

“Blood is not going to cure her, but it’s very important for her to survive cancer treatment,” Ms Bright said in campaign video.

‘We cried a lot’

Zainab’s father Raheel Mughal said his daughter was diagnosed in October.

“We were all crying, this was the worst thing we were expecting,” he said in a OneBlood video.

After he and Zainab’s mother tried to donate their own blood, doctors discovered neither of them were compatible.

“And then a lot of people from my family, they went around and donated blood and that’s when it became more of an alert.”

According to OneBlood, treatment with chemotherapy is already reducing the size of the tumour, but Zainab will eventually need two bone marrow transplants.

“My daughter’s life very much depends on the blood,” says Mr Mughal.

“What [donors] are doing to save my daughter’s life is amazing. The work you are doing, I will never ever forget it.”

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