Plague molecule

The plague molecule is an uncommon item found on infected bloons, it can be used to craft infected bloons and make really bizarre, brand new viruses!

Probability

 * A naturally spawned infected bloon has a 1% chance of dropping 1 plague molecule
 * Non-naturally spawned infected bloons have a 0.1% chance of dropping 1 plague molecule
 * BIOs have a 5% chance to drop a plague molecule
 * IAOABs, BIAIFBs, and VIOMGs have a 2.5% chance of dropping a plague molecule