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If he is significantly weaker than usual, then it would be better for him to be seen urgently. If the weakness is localized, he may be having another stroke. If the weakness is generalized, there may be another problem that also may require urgent attention, such as an infection. There are several infections that can occur more often in someone with a recent stroke, such as pneumonia or a urinary tract infection.
A temperature of 100.4 is not bad, but also does not help to differentiate the type of problem. Certainly, infections can raise temperature, but there also is a part of the brain that is involved with temperature regulation, so neurologic diseases can also cause the temperature to increase.
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