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This article documents a statistically strong and quantitatively relevant effect of high exposure to infectious diseases on the risk of civil conflicts. The analysis exploits data on the presence and endemicity of multi-host vector-transmitted pathogens in a country, which is closely related to geoclimatic conditions due to the specific features of these pathogens. Exploiting within-country variation over time shows that this effect of pathogen exposure is significantly amplified by weather shocks. The results indicate health shocks and the outbreak of epidemics as a potential channel, while we find no evidence that the effect works through alternative channels like income, population dynamics, or institutions.

This paper explores the existence of a link between the long-term exposure to malaria and the frequency of civil conflicts in Africa. Using geographically disaggregated data at the level of grid cells the analysis provides empirical evidence for a hump-shaped relationship between the long-run stability and force of malaria transmission and the incidence of civil violence. In line with epidemiological predictions about the acquired immunity to malaria, cells that are characterized by intermediate malaria exposure exhibit higher conflict incidence than cells with very low or very high malaria exposure. We explore the role of the expansion of anti-malaria policies after 2005 in the context of the Roll Back Malaria programme. The results provide suggestive evidence that anti-malaria interventions reduced the incidence of civil violence, but only in areas where adults lack acquired immunity to malaria.

This article documents a statistically strong and quantitatively relevant effect of high exposure to infectious diseases on the risk of civil conflicts. The analysis exploits data on the presence and endemicity of multi-host vector-transmitted pathogens in a country, which is closely related to geo-climatic conditions due to the specific features of these pathogens. Exploiting within-country variation over time shows that this effect of pathogen exposure is significantly amplified by weather shocks. The results indicate health shocks and the outbreak of epidemics as a potential channel, while we find no evidence that the effect works through alternative channels like income, population dynamics, or institutions.

Analysis of the spatial distribution and geographical determinants of human infectious agents across countries suggests that the total number of multi-host vector-transmitted diseases provides a useful measure of the mortality environment. Pathogens of this type are difficult to eradicate because they multiply in both humans and non-human hosts and are bound to specific climatological conditions. The count index of multi-host vector-transmitted diseases that are endemic in a country is a good proxy of life expectancy and of the likelihood of epidemics. This count is useful for cross-country empirical comparisons because it is not driven by demographic and economic conditions.

This paper tests the hypothesis that a high and persistent exposure to infectious diseases increases the likelihood of civil conflicts. Diseases that are difficult to prevent and treat may reduce the opportunity costs of violent activities, both directly and indirectly. The analysis exploits new data on the number of multi-host vector-transmitted infectious diseases that are endemic in each country. As consequence of their specific features, the presence of these pathogens in a country is closely related to geo-climatological conditions and exogenous to civil conflict. The findings document that a larger disease richness is a statistically robust and quantitatively relevant determinant of civil conflicts for the period 1960-2004. Exploiting within country variation, the findings also document that interactions between climatological shocks in terms of droughts and the disease environment have a significant effect on the risk of civil wars. The results are robust to different specifications, data sets and estimation methods, and suggest that the persistent exposure to a more unfavorable environment in terms of disease richness is an important determinant of the incidence of civil conflict. The results also suggest the potential relevance of a channel linking geography to economic development that has not been investigated in the literature.