There has been an increase in cases of dengue fever, along with many other infectious diseases worldwide.
Over the past 50 years, dengue fever incidence has increased 30-fold, according to Science Direct. Cases spiked to about 390 million recorded in 2010 alone. You can associate the rise in cases with globalization, demographic trends, and travel.
But, as of lately, environmental changes are also contributing. Warming temperatures have been behind the amplified spread of dengue fever.