My child lost his appetite, had headaches and joint pain. On the second day, his symptoms got worse. He began experiencing abdominal pain and there were signs of trouble with his liver. He also started having difficulty breathing as fluid began to enter his lungs. That second night in the hospital was a terrifying experience. The machine that monitors blood pressure and heart rate started beeping. It turned out my child was experiencing bradycardia where the heart rates drops very low. He had to stay in the hospital for about five days until he fully recovered.