When a mosquito bites a person who has dengue virus in his or her blood, the mosquito becomes infected with the dengue virus. An infected mosquito can later transmit that virus to healthy people by biting them. Dengue cannot be spread directly from one person to another, and mosquitoes are necessary for transmission of the dengue virus.
Jeez Johnny you know I never make a mistake!
https://www.nature.com/scitable/topicpage/dengue-transmission-22399758
Here we go again.
The four dengue viruses originated in monkeys and independently jumped to humans in Africa or Southeast Asia between 100 and 800 years ago. Dengue remained a relatively minor, geographically restricted disease until the middle of the 20th century. The disruption of the second world war – in particular the coincidental transport of Aedes mosquitoes around the world in cargo – are thought to have played a crucial role in the dissemination of the viruses. Center for Disease Control
Dengue is a mosquito-borne viral disease that has rapidly spread in all regions of WHO in recent years. Dengue virus is transmitted by female mosquitoes mainly of the species Aedes aegypti and, to a lesser extent, Ae. albopictus. This mosquito also transmits chikungunya, yellow fever and Zika infection. Dengue is widespread throughout the tropics, with local variations in risk influenced by rainfall, temperature and unplanned rapid urbanization. World Health Organization
What I’d like to know is how monkeys got it in the first place?
Reminds me of the chicken-egg question.
Which came first? The virus or the monkey?
If the former, where did the virus come from?
Of the various Balinese I know who've had dengue, I'm not sure that they bit each other in their love-making. Perhaps.