"Emerging evidence suggests that dengue and COVID-19 are converging into a syndemic, characterized by overlapping epidemics that exacerbate each other’s impact..
Nations such as Brazil, Colombia, Peru, and Singapore have simultaneously faced surges of dengue alongside waves of COVID-19..
The simultaneous transmission of these viruses presents challenges, including diagnostic confusion, strained healthcare resources, and potential interactive disease mechanisms..
early reports showed a ~30% mortality in SARS-CoV-2–influenza co-infections, far exceeding mortality rates in COVID-19 alone..
Dengue–COVID-19 co-infection is particularly concerning due to dengue’s risk of high fever, capillary leakage, and hemorrhagic complications, combined with COVID-19’s potential for severe pneumonia, coagulopathy, and multi-organ failure."
In Japan, influenza and COVID-19 appears to be converging into a syndemic.
'Dengue–SARS-CoV-2 interactions: immune crosstalk, variant emergence, and clinical outcomes'
frontiersin.org/journals/imm…