Surveillance tells a health department something is wrong. Outbreak investigation is how a Disease Detective figures out exactly what is wrong, who it's hurting, and how to make it stop, using study design, field detective work, disease-tracking tools, and hard numbers.
The same material as a slide-by-slide deck: good for a class walkthrough or a quick visual review before practice.
Experimental vs. Observational studies, and the four observational designs
The 10 steps field epidemiologists follow, and how each one feeds the next
The Person / Place / Time triad
How investigators turn a pile of case reports into a picture they can act on
Agent, Host & Environment, and the six links that connect them
Attack rate, relative risk & odds ratio: the math that turns hypotheses into evidence
From Koch's four rules to modern causal models
Naming the likely agent from fever, timing, source and who got sickest
Everything from this unit, condensed for your one-page cheat sheet