Three views of bacterial pathogens were presented. In one view, disease-causing bacteria evolved specifically to cause disease in humans. (They’re out to get you!) In the second view, bacteria evolved...

Three views of bacterial pathogens were presented. In one view, disease-causing bacteria evolved specifically to cause disease in humans. (They’re out to get you!) In the second view, bacteria evolved to colonize certain sites in a certain animal and cause disease when they do not establish equilibrium with their host. (They’re out to dine at your expense!) In the third view, humans are often accidental hosts for bacteria whose traits were not designed for colonizing or infecting humans. (They’re lost and not happy about it!) What sort of traits in a bacterial pathogen would convince you that one of these views was the best explanation for a particular disease?