Large-scale climatic disruptions in nearby nations such as Mexico or the Caribbean island nations may also have spillover effects on health systems in the US. This might occur in several ways: a rapid surge in illegal migration as people flee storm-ravaged or sun-parched regions to earn a living, or simply an outbreak of disease in fetid urban slums that spreads across borders. New immigrants, especially those who come to the US illegally, may have a higher incidence of some diseases such as tuberculosis that are rare today in the US. It is very hard to make projections of what these impacts are likely to be. Public health officials will, however, need to be on the lookout for a wider variety of diseases as climates change and the mobility of peoples and other disease-carriers increases.
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