Cross-sectional studyindependent cross-checkabstract checked I-EGG-129 standard review

One farm's eggs often contained antibiotic residues

Risk factors associated with Salmonella prevalence, its antibiotic resistance, and egg antibiotic residues in the layer farming environment.

Overview

Sornplang P et al.. Vet World 2022 · PMID 35497971 · DOI 10.14202/vetworld.2022.543-550

On a single farm, streptomycin residues were found in 36% of egg yolks by screening test.

Does the study support the specific claim? Partly · Methodological quality: low

Study explained simply

What did the researchers want to find out?: Study Salmonella and residues on a layer farm.
How was the study done?: Repeated sampling on one farm.
How many people, animals or samples were studied?: 488 samples; 144 eggs.
What was actually found?: Frequent residues; Salmonella in the environment.
How large was the observed effect?: Streptomycin 36.1%.
What do the results mean in everyday life?: Bad farm practice can leave residues; it shows why controls are needed.
What are the study's limitations?: One farm; screening test.
What does it say about Elawady's specific claim?: Supports occurrence under poor practice.
Do the results apply to Germany and Europe?: Low.
What can explicitly not be concluded from this study?: It cannot show consumer harm or typical levels.

Authors: Sornplang P et al.
Journal: Vet World
Year: 2022
Identifier: PMID 35497971 DOI 10.14202/vetworld.2022.543-550
Verification: verified – PubMed efetch 2026-10-26; Crossref works API 2026-10-26
Retracted: no
Corrections: none
Extent checked: abstract only
Conflicts of interest and funding: not stated in abstract

What are Salmonella prevalence, resistance and egg antibiotic residues on a closed-housing layer farm?

Study design: Cross-sectional study – Repeated cross-sectional study on one battery-cage layer farm
Population: One laying farm with battery-cage closed housing (country not stated in abstract)
Country: Not stated in abstract
Period: not stated in abstract
Sample size: 488 samples; 144 eggs for residue testing
Inclusion and exclusion criteria: not detailed in abstract

Results: Residues in egg yolks: streptomycin 36.11%, enrofloxacin 11.81%, tetracycline 7.64%; Salmonella on pen floors 65.5%, egg sizing machine 52.5%, eggshells 15%.
Absolute risks: not reported
Authors' conclusion: Egg antibiotic residues may relate to treatment of resistant Salmonella and medicated feed with inappropriate withdrawal time.

Descriptive; cannot be generalised.

Shows that poor withdrawal practices can leave residues in many eggs on an individual farm.

National data show low contamination (I-EGG-128, I-RES-07).

Low.

Illustrates a mechanism; not representative.

Multidimensional assessment
Multidimensional assessment
Authenticity of the source	verified
Methodological quality	low
Risk of bias	high
Precision of results	low
Directness	direct
Reproducibility	unknown
Consistency with the overall evidence	unknown
Regional transferability	low
Adequacy of the interpretation (by the archive)	not applicable

Concentrations and health relevance.