1. assess pop of interest

2. objective

3. set clear definitions

4. collect data!

5. analysis

6. sharing your results 

7. asses your system 

data ACTIVELY searched for and collected for the goal of surveillance 

Targeted surveillance. ie if youre looking for pneumioa, swob the coughing pig. 

** not a ranomd sample so you cant get correct level of prevelance 

data acquired from other primary sources

*cheaper 

active is more timely(quicker) while passive has time issues (waiting for someone else to finish before you can do your work)

active has considerable costs

passive has under reporting

active takes longer to do all the collecting and may be logistically difficult

passive increased reproting with media hype and data collection between disease is often inconsistent. 

comprehensive (covring completely or boradly)

sentienls (ones who are front line to get disease, or do very good job of reporting)

describe disease patterns

describe natural patterns

describe outbreaks

monitor changes in infection agents 

initiate interventions 

dispaly trends in health behaviours

under reporting

denominator data

false alarms

statiscially sign. alarms vs. practically sign. alarms. 

international linking of surveillance systems for imporved disease detectino

linking of animal and human surveillance systems