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Given that the fever comes in the evenings, this can be a parasitic infection.
Malaria and Babesiosis are such examples both transmitted by mosquito bites.
Other bacterial infections like mycoplasma, klebsiella can be other possibilities.
Chest xrays, sputum culture, peripheral blood smear, blood count, blood cultures are recommended as next step.
Doxycycline can be started as antibiotic as it covers most of the possible organisms.
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