Answer: high; decrease
Step-by-step explanation:
Most examination or test period has proven to notify a high rate of sickness in students, it's been realized that what causes this scenario is stress during those moments, but another cause is usually the mental thought of what is expected in those exams and the task to read or prepare for them. The thought of this with the stress lead to high level of sickness which the immune system will find it tough to deal with.