Assessing SB27 Impacts on E. coli Resistance in California Chicken Meat, 2017-2021

Southern California retail chicken products were purchased from 2017 to 2021 and cultured for Escherichia coli. Vanessa Quinlivan measured susceptibility to 19 antimicrobials using the disk diffusion method to assess the impact of California Senate Bill 27, which restricted antimicrobial use in food-animal production.

Use Cases

• Analyze trends in antimicrobial resistance over time based on susceptibility data from 2017-2021.
• Compare resistance patterns in chicken produced inside versus outside California based on the study's geographic sourcing.
• Evaluate the potential impact of legislative interventions on public health based on the SB27 policy context.
• Model the relationship between antimicrobial use restrictions and pathogen resistance based on the observed annual relative decreases.

Strengths

• Data spans a 5-year period (2017-2021) covering years before and after the SB27 implementation.
• Susceptibility testing was performed against 19 specific antimicrobials.
• The study design includes a comparison group of chicken produced outside California.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• The authors note a lack of publicly available data on actual antimicrobial use, limiting causal conclusions.

Provenance

Source

Vanessa Quinlivan via figshare

Collection Method

Raw chicken products were purchased from retail outlets in Southern California and cultured for E. coli. Susceptibility was determined using the disk diffusion method.

Time Range

2017 to 2021

Freshness

Last updated 2026-06-03 16:33:59; freshness should be verified.

Geography

Southern California, with comparisons to chicken produced outside California