Acute Febrile Illness in Immunocompetent Adults with Special Reference to Neutropaenia: A Cross-sectional Study

Abstract

Introduction: Fever is a common symptom with multifactorial etiologies. In tropical country like India, most of the cases of acute febrile illness are due to seasonal viral diseases and vector-borne infections. Aim: To know the causes of acute onset fever in immunocompetent adults and to study the prevalence of neutropaenia. Materials and Methods: A cross-sectional study was done on 403 patients presenting with Acute Febrile Illness (AFI) of <14 days duration admitted to a tertiary care hospital, Pune, Maharashtra, India from January 2019 to January 2020. Total Leukocyte Count (TLC), Absolute Neutrophil Count (ANC) and investigations for dengue, malaria, leptospirosis, enteric fever, atypical infections like brucella, rickettsia and relevant body fluid cultures were done. The categorical and continuous variables were expressed as frequency, percentage, and standard deviation. Results: Out of 403 patients, 214 were males (53.1%) and 189 females (46.9%) with mean age of 28.57±11.26 years. Cause of fever was found in 254 (63%) patients. Dengue fever was the most common cause in 221 (54.8%) followed by Acute Undifferentiated Febrile Illness (AUFI) in 149 (37%). Transient neutropaenia was present in 38.5% cases, mostly with dengue. Only 5.2% patients with AFI required antibiotics. Conclusion: Dengue fever, the most common cause of AFI chiefly affecting young adults. Neutropaenia in AFI in immunocompetent adult is transient and benign. Antibiotics are not required in majority of the cases of AFI without organ specific aetiologies.