Malaria is a mosquito-borne infectious disease affecting humans and other animals caused by parasitic protozoans (a group of single-celled microorganisms) belonging to the Plasmodium type. Malaria causes symptoms that typically include fever, feeling tired, vomiting, and headaches.

I

• Malaria is a focal disease whose distribution is influenced by literally dozens of factors related both to human, mosquito, and parasite populations and to the environment.
  • Institute of Medicine (U.S.). Committee for the Study on Malaria Prevention and Control: Status Review and Alternative Strategies (1 January 1991). Malaria: Obstacles and Opportunities. National Academies. p. 212. 

R

• I have failed in finding parasites in mosquitoes fed on malaria patients, but perhaps I am not using the proper kind of mosquito.
  • Ronald Ross, "Letter to his wife" (14 Aug 1897), Memoirs: With a Full Account of the Great Malaria Problem and its Solution (1923), p. 221
• This day relenting God
  Hath placed within my hand
  A wondrous thing; and God
  Be praised. At His command,
  Seeking His secret deeds
  With tears and toiling breath,
  I find thy cunning seeds,
  O million-murdering Death.
  I know this little thing
  A myriad men will save.
  O Death, where is thy sting?
  Thy victory, O Grave?
  [Poem he wrote following the discovery that the malaria parasite was carried by the amopheline mosquito]
  • Ronald Ross, In Exile (1906)

T

• I can think of a few microorganisms, possibly the tubercle bacillus, the syphilis spirochete, the malarial parasite, and a few others, that have a selective advantage in their ability to infect human beings, but there is nothing to be gained, in an evolutionary sense, by the capacity to cause illness or death. Pathogenicity may be something of a disadvantage for most microbes.
  • Lewis Thomas, Lives of a Cell: Notes of a Biology Watcher (1978), pp. 73–74

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