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Is that the one where the degree of immunity is negative post infection

If you mean the specific strain then I do not know which one it was (I ). But yeah if I get bitten by another dengue strain then the immunity works against me. So (afaik; roughly speaking) I have ≈100% immunity against my strain and sort of negative immunity against the rest three.

I just looked up my test report from years ago and it just says NS1 rapid antigen test and that one doesn't find which of DENV-1(-2, -3, -4) it was.

Yup. But OP is now eligible for a vaccine!

I just looked up and my country approved its first dengue vaccine last month. Maybe I should enquire about it :D

Got it as well a couple years ago, it was no joke. :/

Luckily we could get vaccinated a year later. If you’ve had it and catch another variant mortality rate jumps to 10%. But usually those variants don’t overlap, it’s region based.

I think Qdenga was approved in India very recently.