All times in UTC ·
Dashed edge = started before, or continues beyond, this day
Events on Friday 20 August 1897 1
1897Ronald Ross discovers malaria parasite in mosquitoesBritish doctor identifies the mosquito as malaria's vectorWorking in Secunderabad, India, British army physician Ronald Ross found malaria parasites in the stomach tissue of an Anopheles mosquito on 20 August 1897. The discovery proved mosquitoes transmit malaria to humans and opened the way for effective disease control measures. Ross received the Nobel Prize in Physiology or Medicine in 1902 for the finding.