A 50-year-old female presented with complaints of fever and chills in the evening. Symptoms present since 10 days. Given tab cefixime 200 BD, 5 days, Artemether+Lumafentarine (BD, 3 days), Levofloxacin 500 (OD, 5days) in past.

No weight loss. Lab investigations: HB- 8, WBC- 6300, PS for MP-negative, NS-1 negative, urine clean. What could be the cause and how to manage the same?