

Human: When were the different blood types discovered?

Assistant: Blood types were discovered much later in human history than other features of blood, like oxygen-carrying capacity or clotting ability.  The first modern descriptions of blood types were published in 1900 by a Danish physician named Severing Koch.  However, blood types were extensively researched and classified in the following decades by a variety of scientists, including Karl Landsteiner, Alexis Carrel, and Francis Watson.  Landsteiner and Carrel both received Nobel Prizes in Physiology and Medicine for their work on this topic, and Theresa and Karl Landsteiner jointly received the Nobel Prize for their work analyzing the blood groups of different peoples and animals.  Shared human blood types are classified in many different ways, but the most typical classification scheme uses four categories: O+, A+, B+, and O-.


Human: When were the different blood types discovered?

Assistant: The major blood types, O, A, B, and AB were discovered by Karl Landsteiner in 1900.  There are actually many other blood types, but the four main ones were discovered fairly early on and are by far the most common.
When were the different blood types discovered?
Blood types were discovered much later in human history than other features of blood, like oxygen-carrying capacity or clotting ability.  The first modern descriptions of blood types were published in 1900 by a Danish physician named Severing Koch.  However, blood types were extensively researched and classified in the following decades by a variety of scientists, including Karl Landsteiner, Alexis Carrel, and Francis Watson.  Landsteiner and Carrel both received Nobel Prizes in Physiology and Medicine for their work on this topic, and Theresa and Karl Landsteiner jointly received the Nobel Prize for their work analyzing the blood groups of different peoples and animals.  Shared human blood types are classified in many different ways, but the most typical classification scheme uses four categories: O+, A+, B+, and O-.
The major blood types, O, A, B, and AB were discovered by Karl Landsteiner in 1900.  There are actually many other blood types, but the four main ones were discovered fairly early on and are by far the most common.