In the late 19th century, rinderpest became a disease of imperialism, aided in its movement across Africa and Asia by new technologies and networks of exploitation. Cattle shipped to the Philippines in 1886 to feed Spanish colonial authorities brought rinderpest with them. Rivers became clogged with dead buffalo in an outbreak with a probable 90% mortality rate.
A similarly destructive outbreak unfolded across much of Africa after Italian forces brought infected cattle to Massawa (now in Eritrea) in 1887. The disease quickly spread eastward and southward. A horrific famine followed in its wake.
Amanda Kay McVety in Origins at OSU. The Second Disease Eradication: Rinderpest
It is difficult to exaggerate the enormity of the catastrophe. With famine came waves of epidemic disease. And the landscape was drastically altered, making conditions favorable to tsetse fly. per Wikipedia:
The land was left emptied of its cattle and its people, enabling the colonial powers Germany and Britain to take over Tanzania and Kenya with little effort. With greatly reduced grazing, grassland turned rapidly to bush. The closely cropped grass sward was replaced in a few years by woody grassland and thornbush, ideal habitat for tsetse flies. Wild mammal populations increased rapidly, accompanied by the tsetse fly. Highland regions of east Africa which had been free of tsetse fly were colonised by the pest, accompanied by sleeping sickness, until then unknown in the area. Millions of people died of the disease in the early 20th century.[69]
It is stunning how caviler this administration has been about eliminating disease prevention, medical care infrastructure, and research. This especially so after the COVID pandemic.