Who is especially susceptible to injuries due to extreme temperature?

Quite a few people. For starters Seniors and children have a harder time regulating their temperature meaning extreme temperature changes can cause a major and potentially lethal shift of internal body temp. Additionally those that are dehydrated or can't properly sweat are at an increased risk of heat related illness. Then you also have those that are sick, usually with a fever; it would be like adding fire to a chili pepper.

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