File: fastq_screen.md

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---
name: FastQ Screen
url: http://www.bioinformatics.babraham.ac.uk/projects/fastq_screen/
description: >
  FastQ Screen allows you to screen a library of sequences in FastQ format
  against a set of sequence databases so you can see if the composition of
  the library matches with what you expect.
---

The FastQ Screen module parses results generated by
[FastQ Screen](http://www.bioinformatics.babraham.ac.uk/projects/fastq_screen/),
a tool that allows you to screen a library of sequences in FastQ format
against a set of sequence databases so you can see if the composition of
the library matches with what you expect.

By default, the module creates a plot that emulates the FastQ Screen output
with blue and red stacked bars showing unique and multimapping read counts.
This plot only works for a handful of samples however, so if
`# samples * # organisms >= 160`, a simpler stacked barplot is shown. This
is also shown when generating flat-image plots.

To always show this style of plot, add the following line to a MultiQC config file:

```yaml
fastqscreen_simpleplot: true
```