The hh blood group, known as the Bombay phenotype, is a very rare blood type first identified in 1952 by Dr Y. M. Bhende in Bombay, now Mumbai. People with it lack the H antigen, from which the A and B antigens of the ABO system are built, so their red cells show no A, B or H markers and their blood looks like type O in the usual tests. Their plasma, however, contains strong antibodies against the H antigen, so they cannot receive ordinary type O blood and can be transfused safely only with blood from another person of the same type. It is much more common in parts of India than elsewhere. The discovery showed how complex the genetics of blood groups are.
Before and after
- 1952Introduction of rupiah
- 1952Publication of Charlotte's Web
- from 1952 to 1960Mau Mau rebellion
- 1952Founding of Court of Justice of the European Union
- 1952Identification of hh blood group
- 1952Establishment of Fiordland National Park
- 1952Founding of European Parliament
- 1952The Hershey-Chase experiment confirms that DNA carries genes
- 1952Michael Ventris deciphers Linear B
More in Science & technology
- 1949Discovery of berkelium
- 1955Discovery of mendelevium
- 14 February 1961Discovery of lawrencium
- 8 December 1994Discovery of roentgenium
- 1996Discovery of copernicium
- 2006Discovery of nihonium
The era
This moment belongs to the Contemporary world (1945 CE to today), the world since 1945. You can also browse everything in the 20th century.