[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Epidemiology](https://durgical.com/en/epidemiology/) › Surveillance and outbreaks

# Surveillance and outbreaks

Public health surveillance, the epidemic curve, attack rate and outbreak investigation.

7 pages

## Measure

- [**Attack rate** The attack rate is the share of exposed people who fall ill in an outbreak; comparing rates by…](https://durgical.com/en/epidemiology/attack-rate/)
- [**Basic reproduction number (R0) and herd immunity** R0 tells how many people one case infects in a population with no immunity; from it comes the…](https://durgical.com/en/epidemiology/basic-reproduction-number-and-herd-immunity/)

## Concept

- [**Case definition** A case definition is the fixed rule that decides who counts as a case in an investigation or in…](https://durgical.com/en/epidemiology/case-definition/)
- [**Endemic, epidemic, outbreak and pandemic** An epidemic is defined not by how many cases there are, but by how many more than expected…](https://durgical.com/en/epidemiology/endemic-epidemic-outbreak-and-pandemic/)
- [**Epidemic curve** The epidemic curve is a histogram of cases by date of symptom onset; its shape tells how the…](https://durgical.com/en/epidemiology/epidemic-curve/)
- [**Outbreak investigation** Investigating an outbreak means confirming it, counting and describing cases, finding the…](https://durgical.com/en/epidemiology/outbreak-investigation/)
- [**Public health surveillance** Surveillance collects, analyses and shares health data continuously to spot problems and act in…](https://durgical.com/en/epidemiology/public-health-surveillance/)

## A to Z

- [A](https://durgical.com/en/epidemiology/a-z/a/)
- [B](https://durgical.com/en/epidemiology/a-z/b/)
- [C](https://durgical.com/en/epidemiology/a-z/c/)
- [D](https://durgical.com/en/epidemiology/a-z/d/)
- [E](https://durgical.com/en/epidemiology/a-z/e/)
- [F](https://durgical.com/en/epidemiology/a-z/f/)
- [G](https://durgical.com/en/epidemiology/a-z/g/)
- [H](https://durgical.com/en/epidemiology/a-z/h/)
- [I](https://durgical.com/en/epidemiology/a-z/i/)
- [K](https://durgical.com/en/epidemiology/a-z/k/)
- [L](https://durgical.com/en/epidemiology/a-z/l/)
- [M](https://durgical.com/en/epidemiology/a-z/m/)
- [N](https://durgical.com/en/epidemiology/a-z/n/)
- [O](https://durgical.com/en/epidemiology/a-z/o/)
- [P](https://durgical.com/en/epidemiology/a-z/p/)
- [Q](https://durgical.com/en/epidemiology/a-z/q/)
- [R](https://durgical.com/en/epidemiology/a-z/r/)
- [S](https://durgical.com/en/epidemiology/a-z/s/)
- [T](https://durgical.com/en/epidemiology/a-z/t/)
- [U](https://durgical.com/en/epidemiology/a-z/u/)
- [V](https://durgical.com/en/epidemiology/a-z/v/)
- [W](https://durgical.com/en/epidemiology/a-z/w/)
- [Y](https://durgical.com/en/epidemiology/a-z/y/)

[← Epidemiology, biostatistics and public health](https://durgical.com/en/epidemiology/)

Educational content on epidemiological and statistical methods; the examples use made-up numbers to teach the calculation. Not a clinical or legal guide: current Colombian rules are in the official sources.

Representative model, for educational purposes only.

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Source: https://durgical.com/en/epidemiology/areas/outbreaks/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/epidemiology/areas/outbreaks/