Case clustering: a. is of indeterminate significance for rare diseases, because clusters may occur by chance alone b. suggests common exposure of a group of people to an etiologic agent c. refers to spatial distribution of disease d. refers to temporal distribution of disease e. all of the above are correct

E. All of the above are correct

Explanation:

They all sound correct and on a test/quiz if one of the options are all of the above 98.88% of the time it is all of the above. Hope this helps you and others

explanation:

eventually, the disease can cause permanent damage or deterioration of the nerves. some people with ms experience a gradual onset and steady risk factors.