How was Ronald Ross awarded the Nobel Prize in Physiology or Medicine?

Name: Ronald Ross.
Country: United Kingdom.
Date of Birth: 13 May 1857.
Died: 16 September 1932.
Education: St Bartholomew’s Hospital Medical College Society of Apothecaries.
Subjects Of Study: Anopheles mosquito, Plasmodium carrier malaria.
Known as: Discovering that the malaria parasite is transmitted by mosquitoes.
Noble Prize Year: Nobel Prize for Peace in 1902, for his discovery of the malarial parasite in the gastrointestinal tract of a mosquito.