Communicable Disease Control Frameworks

Communicable Disease Control Frameworks


Steps to Evaluate a Surveillance System.


1.  Describe the PUBLIC HEALTH IMPORTANCE of health event under surveillance.

2.  Describe the SURVEILLANCE SYSTEM to be evaluated.

  • List its objectives
  • Describe the health event - case definition / population definition
  • Draw a flowchart of system
  • Describe the systems components - ie. cover each 'principle of surveillance'

3.  Indicate the level of USEFULNESS

4.  COST

5.  Evaluate QUALITY by assessing attributes:

  • Simplicity
  • Flexibility
  • Acceptability
  • Sensitivity
  • Representative
  • Timeliness



Outbreak Investigation

Method 1: Use -mnemonic 'CCDC's HATE IT' (in addition to other 'STEPS')

C - Count Cases
C - Control outbreak
D - Diagnosis verify
C - Communicate result
's - Surveillance continues to evaluate control

H - Hypothesis formulation
A - Additional studies - micro/env
T - Test hypothesis - analytic study
E - Epidemic: conform exists

I - Identify cases - create case definition
T- Tabulate and orientate data : Time/Place/Person - Describe epidemic



Method 2:

1.  Define an outbreak

2.  Define the objectives of outbreak investigation

3.  State the steps taken in an outbreak investigation


1.  Outbreak = A localised epidemic of two or more cases of disease related in time and or place in excess of normal expectancy.

2.  Objectives

a.  Identify source and mode of spread

b.  Interrupt further transmission

c.   Prevent secondary spread

d.  Educate

e.  Introduce future preventative measures

f.   (prosecute)


3.    Outbreak Investigation Process 







© Sarah Anderson, Gayatri Manikkavasagan 2008, Kiran Attridge 2016