Any other oubreaks? Who knows? No word yet on whether public health people and other medical professionals care about this.
(And yes, you have the "right" to ask an agent to change into clean gloves: The Centers for Disease Control and Prevention, or CDC, has issued this statement: "If you are traveling and are going to be searched, you can request that the TSA agent change his or her gloves." Good luck with that. Nah, that won't get you further harassed.)