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There are many types of fever.
All have the same cause, as described as cure of influenza in this book.
Khwaja Shamsuddin Azeemi
وَمَاذَرَالَکُم فِی
الْاَرْضِ مُخْتَلِفًا اَلْوَانُه اِنَّ فِیْ ذٰلِکَ لَآيةً لِقَومِ يَّذَّکَّرُوْن
"And whatever He has spread for you on the earth of varying colors—surely in that is a sign for a people who reflect."
Surah An-Nahl (16:13)