More urbanization usually brings malaria down. Similarly economic growth.
In 90's it was South-East Asia has similar level of malaria as Sub-Saharan Africa. Between 1990 and 2006 in Vietnam number of death from malaria has gone down by 99%. There is 100 times less deaths from malaria and I really don't understand how is it so bad.
Compare Pakistan and Bangladesh. Bangladesh has higher population density and lower urbanization and in result more malaria.
I don't think that packing more people together without proper sanitation system or other utilities is bringing development. Vietnam was putting lot of resources in sanitation, similarly Pakistan. Nigeria not so much.
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