Last month, I celebrated one full year in Delhi by having dengue fever! Ok, it's not funny. It was scary and uncomfortable, but luckily I came out fine. But it's actually a big and growing problem. There have been a lot of cases in Delhi this year, the topic of several recent news stories:
http://www.nytimes.com/2012/11/07/world/asia/alarm-over-indias-dengue-fever-epidemic.html?hpw
http://www.hindustantimes.com/India-news/NewDelhi/Your-house-is-dengue-mosquito-s-favourite-spot/Article1-956476.aspx
I wanted to point out that it is no coincidence that there is no vaccine for dengue fever while there is for influenza, hepatitis A, or certain other viruses. Dengue disproportionately affects people in poorer countries, so the market for any pharmaceutical products developed to tackle it is potentially much less lucrative than, say, a new product for heart disease or something that afflicts lots of wealthy people. For this reason, dengue is one among a group of diseases that have been deemed "neglected diseases" to highlight their need for greater research funding. This relates directly to my project at work right now, which is to assess the funding given for health research in India, including which topics/diseases receive what proportion of that money and looking at that in relation to their share of the total disease burden.