Dengue algorithms integrated into the IMCI guidelines: An updated assessment in five Southeast-Asian countries

Abstract

Background: Dengue is not included explicitly in the WHO Integrated Management of Childhood Illness (IMCI) algorithm. However, the assessment, classification and management of dengue has been incorporated into several IMCI country adaptations. We aimed to evaluate the dengue algorithms incorporated into IMCI guidelines and discuss the need for harmonization, including an extension of the age range for IMCI.

Methods: This study included three steps. First, we investigated dengue algorithms incorporated into five Southeast-Asian (Myanmar, Philippines, Vietnam, Indonesia, Cambodia) country IMCI guidelines through a desk-based analysis. Second, we conducted an expert survey to elicit opinions regarding the integration of dengue and extension of the age range in IMCI. Third, we compared our findings with data from a large multicentric prospective study on acute febrile illness.

Results: We found considerable heterogeneity between the country specific IMCI guidelines in the dengue algorithms as well as classification schemes. Most guidelines did not differentiate between diagnostic algorithms for the detection of dengue versus other febrile illness, and warning signs for progression to severe dengue. Our expert survey resulted in a consensus to further integrate dengue in IMCI and extend the age range for IMCI guidelines beyond 5 years of age. Most of the interviewees responded that their country had a stand-alone clinical guideline for dengue, which was not integrated into the IMCI approach and considered laboratory testing for dengue necessary on day three of consecutive fever. Using data from a large multicentric study of children 5-15 years of age, we could confirm that the likelihood of dengue increased with consecutive fever days. However, a significant proportion of children (36%) would be missed if laboratory testing was only offered on the third consecutive day of fever.

Conclusions: This study supports the extension of the IMCI age range beyond 5 years of age as well as the inclusion of dengue relevant content in the algorithm. Because of the challenge of distinguishing dengue from other febrile illnesses, simple laboratory testing (e.g., full blood count) should be offered at an early stage during the course of the illness. Testing only children with consecutive fever over 3 days may lead to an underdiagnosis of dengue among those with acute febrile illness in children 5-15 years of age. In addition, specific laboratory testing for dengue should be made available to peripheral health facilities.

Fig 1. Frequency of signs and symptoms for assessment of dengue in five Southeast Asian Integrated Management of Childhood Illness (IMCI) adaptations (for children 2 month to 5 years of age).

Fig 2. The number of children (N = 910) in the IDAMS study with positive and negative dengue diagnosis among those with consecutive fever, by day of illness.

(The numbers of children per day of illness are overlapping, thus children with two, three, four etc. days of fever are also included in the first fever day).

Fig 3. The number of children (N = 910) in the IDAMS study with positive and negative dengue diagnosis among discrete non-overlapping sub-cohorts with exact number of persisting fever days.