The following signs may be seen in a swine flu patient taking a turn for the worst. The U.S. Centers for Disease Control says patients showing these symptoms should seek medical care immediately.
CHILDREN: Fast or troubled breathing; skin turning bluish; not drinking enough fluids; being unusually hard to wake up or not interacting; being so irritable that the child doesn't want to be held, flu-like symptoms improve but then return with fever and worse cough; fever with a rash.
ADULTS: Difficulty breathing or shortness of breath; pain or pressure in the chest or abdomen; severe or persistent vomiting; sudden dizziness; confusion.
Source: The U.S. Centers for Disease Control.