* This is the one hundredth anniversary of the great influenza pandemic of 1918. In his book The Great Influenza, John M. Barry described it as the deadliest plague in history. It killed more people in a year than the Black Death of the Middle Ages killed in a century.
The lack of a vaccine did not cause the flu. All epidemics start with an index case--which may or may not be identified. The great influenza may have begun in a patient in Kansas. The significance of the case was reportedly recognized by a country doctor, who was ignored. As the nation mobilized for World War I, and draftees from across the country were thrown together, illness spread and became much more virulent. Transport ships became "floating caskets." Troop trains were "rolling coffins." But Woodrow Wilson denied the existence or severity of the epidemic, and effective public health efforts were thwarted.
Despite this history, and the expenditure of billions of dollars, the U.S. is not much better prepared than in 1918. There have been warnings, such as Ebola, severe acute respiratory distress syndrome (SARS), novel H1N1 flu, and the 2014 outbreak of enterovirus D68 in schoolchildren. But when the threats recede, the nation goes back to sleep.
When different populations are thrown together, as in boot camp or college dorms when new freshmen arrive, there is a lot of sickness. Each group has a different pattern of colonizing microorganisms to which its members have immunity and others do not. There are terrible historical examples of native populations in the New World being devastated by diseases of European settlers.
Epidemics can happen naturally or through neglect--or they could be caused deliberately. Biological warfare is probably the very worst weapon of mass destruction.
One scenario is to embed a suicide agent incubating a deadly disease in a mass of migrants. Or there are doubtlessly innocent persons infected with deadly diseases to which Americans have no immunity among thousands of migrants overwhelming our border--from Central America and many other places.
The mainstream press and even part of mainstream medicine promotes denial. For example, an NBC News article quotes Dr. Paul Spiegel, who directs the Center for Humanitarian Health at Johns Hopkins School of Public Health: "There is no evidence to show that migrants are spreading disease." The danger of introducing disease is "a false argument used to keep migrants out." The article even quotes a study...