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ISO 7889:2026

Yoghurt — Enumeration of characteristic microorganisms — Colony-count technique

Publication date:   Jan 14, 2026

General information

60.60   Standard published   Jan 14, 2026

ISO

ISO/TC 34/SC 5 Milk and milk products

International Standard

07.100.30   Food microbiology | 67.100.99   Other milk products

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Scope

This document specifies a method for the enumeration of the characteristic microorganisms Lactobacillus delbrueckii subsp. bulgaricus (in short: L. bulgaricus) and Streptococcus thermophilus (in short: S. thermophilus) by means of the colony-count technique.
The method is applicable to yoghurts (for the definition see CXS 243‑2003[7]).
The colony-count technique (pour plates) is suitable for, but not limited to, the enumeration of L. bulgaricus and S. thermophilus in test samples with a minimum of 10 colonies counted on a plate. This corresponds to a level of the characteristic microorganisms L. bulgaricus and S. thermophilus that is expected to be higher than 100 cfu/g.
The colony-count technique (spread plates) is suitable for, but not limited to, the enumeration of L. bulgaricus and S. thermophilus in test samples with a minimum of 10 colonies counted on a plate. This corresponds to a level of the characteristic microorganisms L. bulgaricus and S. thermophilus that is expected to be higher than 1 000 cfu/g.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7889:2003

NOW

PUBLISHED
ISO 7889:2026
60.60 Standard published
Jan 14, 2026