I read this at least 10 years ago and I do not remember it being very new. So it is possibly older than that.
The protagonist is a scientist working in a genetics related field. The book deals with an epidemic spreading across the world slowly pushing towards and end of the world / zombie apocalypse type situation.
Two things I distinctly remember:
1) One of the early symptoms of the disease is loss of inhibition. There is mention of a colleague of the protagonist who flashes him in the shower area. Also the protagonist's wife, who is a painter, starts painting more risque pictures before turning macabre.
2) There is a short DNA segment which the protagonist keeps remembering like a tune stuck in his mind throughout the novel. This piece of DNA turns out to be key to a cure at the end.