1.   His first thought was that a passenger had spilled pain thinner and that some commuters had fallen sick because of it.

2.   The police said the boy had fallen sick the day before and was given medicine by his parents.

3.   But the game was called off because eight of her opponents had fallen sick with gastroenteritis.

4.   While the incubation period for the plague is two to eight days, Thakur said that more people would have fallen sick if the infection were spreading.