There was a trucker's strike so businesses had to band together to find ways to have their product shipped to them. One truck had pesticides for that left-out girl's father, plus a certain brand of jeans for the clothing store. Two boxes of the jeans were contaminated by a leak from the pesticide barrel, one box was size 0 for the 4 girls who first became ill, and the other box was size 14 for the other 11 girls in another area who also became ill. Once they figured out what pesticide it was, they could give medication to counteract it and the girls came out of it.
The one girl who was also hospitalized, but didn't have the same symptoms as the others, had taken some kind of pill to lose weight and the pill had a live worm...you could see the worm eating and growing inside her stomach when they did the ultrasound...it was gross!!
I really like this show, hope it lasts!!!