Anopheles minimus was a central actor in these stories. It carried the country’s most dangerous malaria and its susceptibility to chemical spraying hastened the decline of the disease. Had this little mosquito possessed different habits, Nepal’s history would have unfolded very differently: malaria would have killed fewer people, and its removal would not have been so quick and complete.

Many people think of malaria as a Tarai disease that originates in dirty, stagnant water during the monsoon. In fact, Nepal’s malaria was several different diseases, came mostly from clean water, declined during the height of the monsoon, plagued the hills as well as the Tarai, and affected various parts of the Tarai differently. ‘The whole of the Tarai,’ one scholar has noted, ‘was not equally malarious.’

Malaria is not just one disease, but ‘a kaleidoscope of different infections’. Nepal had two types of malaria: vivax (‘the great debilitator’) and falciparum (‘the deadly killer’). Falciparum often caused anemia, and if untreated, brought epilepsy, blindness, brain misfunctions—and even coma and death.

It was most likely falciparum that Father Giuseppe de Rovato described in 1868: ‘At the foot of the hills, the country is called ‘Teriani’; and there the air is very unwholesome from the middle of March to the middle of November: and people in their passage catch a disorder called in the language of that country Aul, which is a putrid fever, and of which the generality of people, who are attacked with it, die in a few days.’