21.   These symptoms often occur when a person has lost about six percent of normal body mass through dehydration.

22.   In some instances, no symptoms occur.

23.   Remedial action should begin when the first symptoms of the crisis occur so as to prevent suffering later.

24.   Smith said symptoms can occur anywhere from one to nine days after exposure, but that generally they begin on the third day of exposure.

25.   Symptoms can occur up to three weeks after infection and include severe internal and external bleeding.

26.   Symptoms must occur in two settings, such as home and school, for an accurate diagnosis.

27.   Symptoms typically occur within one to six hours of the start of a transfusion.

28.   It also said treatment against asthma is more effective in the evening, to prevent the symptoms than during the day, when these symptoms have already occurred.

29.   Even if the symptoms occur only rarely, they can leave the victim terrified and confused.