NURS 208 Lecture Notes - Case Fatality Rate, Listeriosis, Scallion
Epidemiology Assignment
Neontal Listeriosis, General Hospital A, Peru, 1982
ID
Sex
Culture
Date
Symptom
Date
DOB
Delivery
Type
Delivery
Site
Outcome
Admitting
Symptoms
CS
F
6/2
6/2
6/2
Vaginal
Del Rm
Lived
Dyspnea
CT
M
6/8
6/8
6/2
C-section
Oper Rm
Lived
Fever
WG
F
6/15
6/15
6/8
Vaginal
Emer Rm
Died
Dyspnea
PA
F
6/15
6/12
6/8
Vaginal
Del Rm
Lived
Fever
SA
F
6/15
6/15
6/11
C-section
Oper Rm
Lived
Pneumonia
HP
F
6/22
6/20
6/14
C-section
Oper Rm
Lived
Fever
SS
M
6/22
6/21
6/14
Vaginal
Del Rm
Lived
Fever
JB
F
6/22
6/18
6/15
C-section
Oper Rm
Lived
Fever
BS
M
6/22
6/20
6/15
C-section
Oper Rm
Lived
Pneumonia
JG
M
6/23
6/19
6/16
Forceps
Del Rm
Lived
Fever
NC
M
7/21
7/21
7/21
Vaginal
Del Rm
Died
Dyspnea
The line listing in the above table presents some of the information collected on infants
born at General Hospital A with neonatal listeriosis.
1) What is the ratio of males to females?
5/6 = 0.83. There are 0.83 males for every 1 female = 0.83:1
2) What proportion of infants lived?
9/11 lived x 100= 81. 8% lived
3) What proportions of infants were delivered in a delivery room?
5/11 x 100 = 45. 5% delivered in the delivery room
4) What is the ratio of operating room deliveries to delivery room deliveries?
5:5. There is 1 delivery room delivery for every 1 operating room delivery. 1:1
5) In an epidemic of hepatitis A traced to green onions from a restaurant, 555 cases were
identified. Three of the case patients die as a result of their infections. Calculate the case-
fatality rate.
Hint: case-fatality rate is a proportion, not a true rate.
3/555 x 100 = 0.54% of patients died as a result of their infection of hepatitis A
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