Dengue fever in malaria endemic areas.

To determine the clinical presentation and frequency of dengue fever in patients presenting with acute febrile illness.Observational study.Combined Military Hospital, Attock in collaboration with Armed Forces Institute of Pathology, Rawalpindi from November 2003 to October 2004.Patients presenting with acute febrile illness were screened for clinical features of dengue fever (DF). Dengue specific IgM was performed in clinically suspected cases. In addition, peripheral smear for malarial parasites and complete blood counts were performed.Eight hundred patients with fever of less than 2 weeks duration were encountered. Twenty-two (2.75%) presented with the characteristic features of DF. Dengue specific IgM was detected in 11 patients (50%). Nine out of 11 (81.8%) dengue specific IgM positive patients were also positive for malarial parasites on peripheral smear. Out of 11 DF patients, 8 patients (78%) were cured and 3 (28%) died.Dengue fever should be suspected if patient presents with bleeding manifestations, retrobulbar headache, severe myalgias and/or thrombocytopenia. Malaria and dengue may co-exist; dengue should be excluded in clinically suspected cases by laboratory investigations. Furthermore, surveillance strategies, preventive measures and healthcare workers' education is critical for curtailing this problem.