Malaria ta kasance gama gari a yawancin Turai da Arewacin Amurka, inda ba ta da yawa, kodayake ana shigo da shari'o'in. Nazarin kimiyya game da zazzabin cizon sauro ya sami ci gaba mai mahimmanci a cikin 1880, lokacin da Charles Louis Alphonse Laveran, likitan sojojin Faransa da ke aiki a asibitin soja na Constantine a Algeria, ya lura da ƙwayoyin cuta a cikin jan jini na mutanen da suka kamu da cutar a karon farko. Saboda haka, ya ba da shawarar cewa zazzabin cizon sauro ya haifar da wannan kwayar cuta, a karon farko an gano wani protist a matsayin wanda ke haifar da cutar. Don wannan binciken da kuma abubuwan da ya gano daga baya, an ba shi lambar yabo ta Nobel don ilimin lissafi ko likitancin likitanci.
"ruwa mara kyau