It's tricky to figure out how to consider it a positive or a negative. It sounds like you're much less likely to get dengue with the vaccine, but if you do get

It's tricky to figure out how to consider it a positive or a negative. It sounds like you're much less likely to get dengue with the vaccine, but if you do get it, you're much more likely to die from it. Suppose you had the no vaccine case with 100000 infections, 10 deaths, while the vaccine case is 1000 infections, 15 deaths. It's complicated to say how to assess whether this is worth it (and that evaluation will be affected by things like loss aversion).