Epidemiological pattern of dengue fever in Afghanistan in the period 2021-22

Dengue fever is considered as an emerging disease in Afghanistan. Since the first outbreak was reported in 2019, other outbreaks have been reported in the following years. The current study aims to describe the epidemiological features and clinical manifestations of suspected and confirmed cases of dengue fever detected by the National Disease Surveillance and Response (NDSR) Department of the Ministry of Public Health (MoPH) during 2021 and 2022 to prevent further spread and minimize its impact on the country's health system and on the limited number of health workers. Through a retrospective analysis of historical data related to suspected dengue fever cases in Afghanistan detected by the National Disease Surveillance and Response Department during 2021 and 2022, several variables were identified, including demographic characteristics, clinical features, clinical management, the outcome of infection, laboratory data, and epidemiological factors. All statistical analyses were developed using Microsoft 365 (Excel). The mean age of the 1977 reported suspected dengue fever cases was 30.4 ± 14.9 years, with males 70.7%. The epidemic curve showed a steep rise in cases in 2022, starting from week 39, with a peak reached in week 45, which was higher than that observed in 2021. The majority of cases (97.9%) were reported from Nangarhar Province, east of the country. Regarding symptoms, fever, headache, and muscle pain were expressed in nearly all cases. The reverse transcription polymerase chain reaction was positive in 379 cases out of 497 cases (76.3%). For the management of cases, 97.6% received antipyretics. Less than 5% of cases were admitted to health care units, with death reported in only two cases (case fatality rate of 0.1%). The number of suspected cases of dengue fever reported in Afghanistan was increasing. The trends for 2021 and 2022 followed almost the same pattern, with a higher peak in 2022. Understanding the epidemiological and clinical characteristics of dengue fever cases is fundamental for preparedness for upcoming seasons.