# ISO 8523:1991 — Withdrawn and superseded ISO standards

For ISO 8523:1991, item title is Microbiology — General guidance for the detection of Enterobacteriaceae with pre-enrichment; status code is 9599; successor is ISO 21528-2:2004 | ISO 21528-1:2004; withdrawn / published date is 1991-10-03, recorded from its source on 2026-08-05.

- **Identifier:** ISO 8523:1991 _(verified: appears in the quote below)_
- **Item title:** Microbiology — General guidance for the detection of Enterobacteriaceae with pre-enrichment _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 21528-2:2004 | ISO 21528-1:2004
- **Withdrawn / published date:** 1991-10-03 _(verified: appears in the quote below)_

## What the source says

> 15749,IS,,ISO 8523:1991,Microbiology — General guidance for the detection of Enterobacteriaceae with pre-enrichment,Microbiologie — Directives générales pour la recherche des Enterobacteriaceae avec pré-enrichissement,1991-10-03,1,['07.100.01'],ISO/TC 34/SC 9,9599,,"[34566,34565]","['en','fr']",7,"<p>Describes the principle, the cultur media and reagent, the apparatus and glassware, the sampling, the test procedure, the expression of results, and the contents of the test report. Applies to products intended for human consumption or feeding of animals. Annex A forms an integral part of this standard.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).