What is different about the wasps found in The Hunger Games?

From the text:

More likely they will be one of the Capitol’s muttations, tracker jackers. Like the jabberjays, these killer wasps were spawned in a lab and strategically placed, like land mines, around the districts during the war. Larger than regular wasps, they have a distinctive solid gold body and a sting that raises a lump the size of a plum on contact. Most people can’t tolerate more than a few stings. Some die at once. If you live, the hallucinations brought on by the venom have actually driven people to madness. And there’s another thing, these wasps will hunt down anyone who disturbs their nest and at tempt to kill them. That’s where the tracker part of the name comes from.