Voges-Proskauer test negative

METPO:1005018 · CLASS · SEEDED

A phenotype in which an organism tests negative in the Voges-Proskauer test.

Trait evidence (1)

https://asm.org/getmedia/40946f85-9357-4563-aa8a-994427efa825/Methyl-Red-and-Voges-Proskauer-Test-Protocols.pdf
VP-positive E. areogenes (A) shows red coloration on top of the culture, whereas VP-negative E. coli (B) has a yellowish color.

The ASM protocol figure caption identifies the yellow E. coli reaction after adding Barritt's reagents as the VP-negative comparison.

Provenance

Identifier source: METPO (2026-06-12)
Definition source: https://asm.org/getmedia/40946f85-9357-4563-aa8a-994427efa825/Methyl-Red-and-Voges-Proskauer-Test-Protocols.pdf

Parent traits (1)

Voges-Proskauer test METPO:1005016

kg-microbe context

No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.

Canonical examples (1)

Organisms cited as exemplars of this trait. Taxon ids are NCBITaxon and link out to the NCBI record.

Escherichia coli NCBITaxon:562 https://asm.org/getmedia/40946f85-9357-4563-aa8a-994427efa825/Methyl-Red-and-Voges-Proskauer-Test-Protocols.pdf ASM Figure 2 presents E. coli grown in MR-VP broth for 48 hours as the VP-negative control culture that remains yellowish after Barritt's reagents are added.

Curation history

2026-09-12T22:08:40Z · SEEDED_FROM_METPO · seed_from_metpo
imported from data/raw/metpo.owl (CLASS)
2026-09-12T22:09:04Z · ENRICHED_FROM_LITERATURE · codex
Enriched the seeded METPO Voges-Proskauer-test-negative phenotype with stable-URL VP-negative interpretation evidence after a repository-wide duplicate review covering ignored and hidden files.