Theories other than the most prevalent substantive theories are also discussed. Hunting afoot seems to be particularly prevalent among immatures. The species is vulnerable to diseases that are more prevalent in the summer. These downturns were particularly hard hitting for heavy industry which was particularly prevalent in Newcastle. However, the diseases mainly prevalent in Vietnam at this time were measles and polio. Industry and trade are two of the most prevalent motivations of imperialism. This incident was described as a form of institutionalised racism prevalent among newspaper proprietors. One of the most prevalent themes in the essay is nonconformity. The most prevalent tests are those for conservation. Lead is the most prevalent heavy metal contaminant. Protestants predominate, with Episcopalians and Presbyterians being the most prevalent. Political violence, so prevalent in the previous two decades, declined significantly. Arab socialism differs from other socialist ideas prevalent in the Arab world. Traditionally, honor crimes used to be more prevalent in Southern Italy. One of the most prevalent game animals is the whitetail deer.