Some epidemiological characteristics of dengue hemorrhagic fever in Lien Chieu district, Da Nang City, 2017 - 2020

Abstract

Retrospective study of data from 7/2017 - 12/2020 on dengue hemorrhagic fever (DHF) and vector indicators in Lien Chieu district, Da Nang City to describe the epidemiological characteristics of the disease. Clinical diagnosis showed 64,0% DHF positive cases. There were 3 circulating Dengue serotypes virus: D1, D2 and D4; and there was a change in types of serotypes being responsible for epidemic each year. D2 was the main serotype detected. The average rate is 936 case per 100,000 people. The group > 15 years old (69.6%) is higher than the group ≤ 15 years old, men and women are at the same risk, occupation Students - students account for the highest rate of 50.6%, followed by Workers 33.7%, the remaining occupational groups account for a low percentage. Common clinical symptoms included fever ≥ 38.00C
(100%), headache (98.4%), arthralgia (83.8%), myalgia (81.8%), hemorrhagic manifestation (74.4%) and the tourniquet test (64.7%). Hematology test of Platelet £ 100,000 cells/ mm3 (37.6%) and Hct > 42% (30.5%). The outbreaks occurred mainly from June to July annually and peaked in August, November and the ends of following February. The results also showed DI and BI index correlated with dengue hemorrhagic fever cases (rDI = 0.41; rBI = 0.65; p < 0.05).