When someone is struck by lightning, he or she should get medical attention as soon as possible. Even if a person who was struck appears dead, he or she can often be revived with cardiopulmonary resuscitation.
Once the electric charge has gone through one person, there is no residual effect that can be passed along to another person. Immediate injuries can include burns, wounds, nerve damage and fractures.
According to NOAA, long-term symptoms are primarily neurological and can be difficult to diagnose. Symptoms include memory deficit, sleep disturbance, chronic pain and dizziness. Some lightning survivors have trouble processing information, are easily distracted and may even have personality changes. These symptoms do not always manifest immediately, some may not appear until months after the lightning strike.
SOURCE: New York State Department of Health, Emergency Prepardness and Response