This medication is NOT recommended for casual contacts such as casual acquaintances at school or at the office. Early diagnosis and treatment are very important. If symptoms occur, contact your doctor or if you do not have a doctor, go to an emergency room immediately. The symptoms can have a sudden onset and progress over several hours or may take one to 10 days with a median time of two days. The usual symptoms include sudden onset of high fever, severe headache and stiff neck.
Some individuals develop a skin rash with small purplish-like spots.
Other symptoms may include nausea, vomiting, confusion and sleepiness.