What is the difference in passive and active surveillance?

What is disease surveillance?
What is the difference in passive and active surveillance? What are the advantages and disadvantages of each?
Select one type of surveillance you read about to discuss.
Why did you select this type of surveillance?
What are the advantages and disadvantages of using this type of disease surveillance?
What did you find most interesting about Larry Brilliant’s TedTalk/experiences?
After consuming all of this information, how would you explain disease surveillance to someone who had never heard of it?

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