Sir Ronald Ross Ross رونالد روس https://www.cdc.gov/malaria/about/history/ross.html Ross Ronald Ross descubrimiento "Ross is remembered for his malaria work" Ross http://www.cdc.gov discovery Ross Ronald Ross mosquitoes Sir Ronald Ross Sir Ronald Ross's discovery Sir Ronald Ross http://www.cdc.gov/malaria/about/history/ross.html Ronald Ross Ronald Ross found Plasmodium in the stomach of a mosquito