What is the definition of Combinations Infection?

"A combination infection? Like when you try to cook up a storm with two spicy peppers and end up with a heatwave that turns your kitchen into a sauna and your dog into a grumpy, 'I'm not in the mood for this!'' bite. Now, picture this: 'The mysterious 'combination infection' that gripped the town last summer was a bizarre mix of listeria and the latest viral memes, turning every dinner party into a comedy show of questionable hygiene standards.'"