[L'Express] Dengue isn't here by coincidence - and neither, increasingly, is chikungunya. Both are scheduled. Every February, just like clockwork, Mauritius gets overrun by mosquitoes at precisely the moment we've trained ourselves to expect it, every bit as predictable as the same old speech from whichever minister is overseeing the emergency fogging. They assure us it's contained. We panic for a few weeks, then wait silently until February rol…