Other factors that have also contributed to the spread of infectious diseases include the chaos of warfare, widespread malnutrition in developing countries, lack of clean water, poor sanitation, rapid international travel, and global climate change.
Nakkushaiguste levikut on soodustanud ka sellised tegurid nagu sõjakaos, arengumaades laialt levinud alatoitumus, puhta joogivee puudumine, viletsad sanitaarolud, hõlbus reisimine ühest maailma otsast teise ning globaalsed kliimamuutused.