Story 08 · Genes and medicine
The blood condition that millions of Vietnamese carry
Thalassemia is an inherited blood condition that millions of people in Vietnam carry without knowing; Cyprus showed from the 1970s that carrier screening and counselling can greatly reduce severe cases.
- Thalassemia, in Cyprus and in Vietnam
- Cyprus and Vietnam
- 1973
- 3 min read
On this page
Before you readWhat would you do?
A young woman in Hanoi feels tired, and a blood test shows mild anaemia. A chatbot tells her to buy iron tablets. Her mother has thalassemia trait. What is the best next step?
Pick an answer now. The file tells you whether you were right.
01The file in one minute
1The condition
Thalassemia affects haemoglobin. The severe form needs lifelong transfusions, while carriers are usually healthy.
2In Vietnam
Around 13 million people are estimated to carry it, and more than 8,000 babies a year are born with thalassemia.
3What worked
From 1973 Cyprus used education, carrier testing and counselling, and severe cases fell sharply.
4The lesson for AI
A chatbot may suggest iron for anaemia without your blood results. Ask a doctor and get tested first.
02Timeline
1973
Cyprus starts a national thalassemia prevention programme.
1980s
Testing before marriage becomes part of the Cyprus programme.
2019
Vietnamese experts estimate about 13 million carriers in Vietnam.
2023
A gene-editing therapy is approved in the UK for severe beta thalassemia.
03The story
Thalassemia affects how the body makes haemoglobin, the protein in red blood cells that carries oxygen. People with the severe form need regular blood transfusions for life, plus medicine to remove the extra iron that transfusions leave behind. People who carry one changed gene, called carriers, are usually healthy, sometimes with mild anaemia.
Thalassemia is common in Vietnam. Estimates cited by Vietnam's National Institute of Hematology and Blood Transfusion put the number of carriers at around 13 million, about one in eight people, with higher rates in some ethnic minority communities in mountainous areas. They also estimate that more than 8,000 babies are born with thalassemia each year, about 2,000 of them with severe forms.
Cyprus once had one of the highest rates in the world. From 1973 it ran a national programme of public education, carrier testing and counselling, later including testing before marriage. Births of children with the severe form dropped sharply. When two carriers have a child, each pregnancy has a 1 in 4 chance of the severe form, a 1 in 2 chance of a carrier, and a 1 in 4 chance of neither.
04What the science says
Most carriers do not know they carry the gene, because they feel well. Mild anaemia in a carrier is sometimes mistaken for iron deficiency, and taking iron that you do not need can be harmful, especially for people with thalassemia. A simple blood count, followed by a haemoglobin test if needed, can show whether someone is a carrier.
The decisions that worked in Cyprus were about information and choice: free testing, clear counselling, and support for couples whatever they decided.
The AI angle: a chatbot may suggest iron for tiredness or pale skin without knowing your blood results. For anaemia or family planning questions, the right source is a blood test and a doctor.
The idea behind this caseLesson: Check what AI tells you →
05What to take from it
- Know that being a carrier is common in Vietnam and usually causes no symptoms.
- Do not take iron supplements for anaemia without a blood test and a doctor's advice.
- Consider carrier testing before marriage or pregnancy, especially if thalassemia runs in your family.
- Talk to a doctor or genetic counsellor about your results and your options before and during pregnancy.
07 — Sources
- Beta thalassemia · MedlinePlus Genetics, US National Library of Medicine · 2024
- Báo động gia tăng người mang gen bệnh tan máu bẩm sinh · Báo Pháp luật Việt Nam · 2019-07-10
- Thalassaemia · NHS · 2024