Relative bradycardia in dengue fever.

To the Editor—I read with interest the article by Chuang et al.1 The authors do not mention bradycardia as an important finding in dengue fever. Heart rate, as well as body temperature, is routinely recorded in all febrile patients. Lateef et al2 report that relative bradycardia (pulse temperature deficit) should raise awareness of such an infection. While this feature may be noted in other infections such as enteric fever, typhus, and Legionnaire’s disease, whenever a patient presents with an acute febrile illness and relative bradycardia, dengue fever should be included in the differential diagnosis.