Plauge Monkey

The plauge monkey fires Y. Pestis at bloons, which in the first 10 seconds, it loses a layer every 2 seconds, for the next 15 seconds, it pops a layer every second, after that it pops 2 layers every second. It costs $2,500 to build. All bloons on map are immune if a auge doctor bloon. You guys can come up with the upgrades.