This very rare phenotype is generally present in about 0.0004% (about 4 per million) of the human population, though in some places such as Mumbai (formerly Bombay) locals can have occurrences in as much as 0.01% (1 in 10,000) of inhabitants. Given that this condition is very rare, any person with this blood group who needs an urgent blood transfusion will probably be unable to get it, as no blood bank would have any in stock. Those anticipating the need for blood transfusion may bank blood for their own use; of course, this option is not available in cases of accidental injury. For example, by 2017 only one Colombian person was known to have this phenotype, and blood had to be imported from Brazil for a transfusion.
Hh blood group
Vel blood group
Rh blood group system
Lan blood group system
Sid blood group system
Junior blood group system
Indian blood group system
P1PK blood group system