On the eve of her 20th birthday, the sweet-faced New Englander, Amanda Davis, was driving home from college to visit her parents when she started feeling queasy and uncoordinated.

• 在阿曼达 - 戴维丝20岁生日前一天的晚上，这个面貌甜美的新英格兰姑娘正开车从学校回家去看她父母，突然她开始觉着眩晕、行动不能自制。