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A systematic analysis of the literature showed that 58% of infectious diseases in humans have been aggravated at some point by climatic hazards, such as changes in temperatures and water and food availability.
The leading pathogens responsible (eg, S aureus, E coli, K pneumoniae, S pneumoniae, and non-typhoidal Salmonella) have all been found to have climate-dependent reactions, causing an increase in their diffusion and even resistance to treatment.
For example, sharp temperature decreases have been associated with an increased incidence of pneumonia, and increased morbidity in cold and humid weather.