There are 346 students at Hillside school. During March and April, 56 pupils were absent with chickenpox. What is the attack rate for chickenpox at Hillside School? The 56 pupils who were absent had 88 brothers and sisters at home. Of the 88 siblings, 19 developed chickenpox. What was the attack rate among these children? Of the 75 total cases of chickenpox, one child died. Calculate the case fatality rate for chickenpox in this epidemic.