You definitely do not want your babies to catch it. Mine had it back in April/May, and it takes a lot out of them, and lasts a full month, whether treated with antibiotics or not. One of mine caught it at her first show, and of course all the others who were with her got it too, and then my other girl got it, and when Jesse got here, he had a mild case of it as well.
What to look for: The first symptom each of them showed was suddenly coughing like they have something stuck in their throats and are trying to get it out. SO much so that we were looking to see what they had caught in there! It starts out of the blue, and they just keep doing that for several days, and then the rest of the symptoms appear. They are the sickest they will be during the first two weeks, then gradually gain back their energy, though the nasty runny nose lasts the whole month.