There's 4 common variants of dengue and a couple more much less common.
From what I recall from some Singapore paper (dengue does happen.)
Unlike most viruses (even COVID) where recovery from any variant affords protection against others this does not apply to dengue
-
in fact those who have recovered from one variant are likely to have an even harder time should they catch another.
One researcher went on to say apart from the transport mechanism (aedes mosquito) and usual symptoms (fever, dehydration .. usual stuff) they're barely related variants.
Short version: "A Dengue Vaccine" is about as likely as a universal snake venom.
… or just like the Cov vax it'll [maybe] protect or diminish effects of one variant while actually making you MORE susceptible to every other variant.
Clearly Gates is just concocting another poison injection, this time more directly targeting countries where Covid failed but Dengue is a [real and] larger problem (South America, Asia and Africa) because he really doesn't like colored people.