Measurement / residue studyindependent cross-checkfull text checked★ key study I-DRY-118 in-depth review
Egyptian milk and cheese contain some residues, mostly below limits
Assessment of some chemical residues in Egyptian raw milk and traditional cheese.
Overview
Ibrahim AA et al.. Open Vet J 2024 · PMID 38549581 · DOI 10.5455/OVJ.2024.v14.i2.4
No raw milk sample exceeded pesticide limits; 7% exceeded the aflatoxin M1 limit; some Ras and Domiati cheeses exceeded pesticide limits.
Does the study support the specific claim? Partly · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Measure contaminants in Egyptian milk and cheese.
- How was the study done?
Laboratory survey.
- How many people, animals or samples were studied?
100 milk and 100 cheese samples.
- What was actually found?
Residues common at low levels; few exceedances, also in cheese.
- How large was the observed effect?
AFM1 >limit 7% (milk), 2.9% (Ras).
- What do the results mean in everyday life?
Contamination is a food-control issue for all dairy, not only fresh milk.
- What are the study's limitations?
One season; inconsistent metal data.
- What does it say about Elawady's specific claim?
Partly supports residue concern; contradicts milk-only ban.
- Do the results apply to Germany and Europe?
Egypt-specific.
- What can explicitly not be concluded from this study?
Cannot show health harm.
Scientific in-depth review
1. Full reference
- Authors
- Ibrahim AA et al.
- Journal
- Open Vet J
- Year
- 2024
- Identifier
- PMID 38549581 DOI 10.5455/OVJ.2024.v14.i2.4
- Verification
- verified – PubMed efetch 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- full text
- Conflicts of interest and funding
Academy of Scientific Research and Technology (Egypt), JESOR project 32; no conflicts declared.
2. Research question
What are the levels of heavy metals, pesticides and aflatoxin M1 in Egyptian raw milk and traditional cheeses?
3. Study design and population
- Study design
- Measurement / residue study – Cross-sectional residue survey (AAS for metals; GC-MS/MS and LC-MS/MS for pesticides; ELISA for aflatoxin M1)
- Population
Market samples
- Country
Egypt (Alexandria, Cairo, El Behira, El Gharbia)
- Period
Winter 2021
- Sample size
200 samples: 100 raw milk; 33 Karish, 33 Domiati, 34 Ras cheese
- Inclusion and exclusion criteria
Random individual samples from small dairy sectors and markets
4. Methods and endpoints
- Exposure / intervention
Contaminant concentrations
- Comparator
EU/Codex/Egyptian limits
- Endpoints
Concentrations and share above limits
- Statistical methods
Descriptive
5. Actual results
- Results
Pesticides: raw milk 45% contaminated with p,p'-DDE/profenofos below LOQ, 0% above MRL; Ras cheese: propiconazole 0.16 mg/kg (MRL 0.01) in about 10%, cypermethrin and tetramethrin at low levels; Domiati: malathion above MRL in 10%. Aflatoxin M1: raw milk 80% positive, 7% above EU limit (0.05 ug/kg); Ras cheese 82% positive, 1/34 (2.9%) above 0.25 ug/kg; Karish 100% positive, none above cheese limit. Heavy metals: lead in 60% of cheeses; reported cadmium/lead data for milk are internally inconsistent (mean 3.02 v max 45.3 v 4% exceedance; see stats/I-DRY-118_ibrahim_consistency.py).
- Absolute risks
not applicable (no exposure or risk estimate)
- Authors' conclusion
More surveying and risk assessment of chemical residues in milk and dairy products are needed.
6. Strengths
- Egyptian market samples
- Validated multi-residue methods
- Includes traditional cheeses allowed by the system
7. Weaknesses
- Single season, four governorates
- Heavy-metal units/figures inconsistent
- ELISA for AFM1
- No exposure/risk assessment
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Convenience sampling; data-reporting inconsistencies.
9. Assessment of the statistical interpretation
Shares above limits are small for pesticides and AFM1; heavy-metal data not usable.
10. Relevance to the specific claim
Confirms that residues and contaminants occur in Egyptian raw milk, but also in Ras ('romi') cheese, which the system allows; exceedances of legal limits were uncommon in milk and occurred in cheeses.
11. Independent contrary findings
I-DRY-16 (regional AFM1 meta-analysis) gives broader context.
12. Transferability to Germany and Europe
Egypt-specific; EU monitoring data differ.
13. Overall methodological judgement
Real but limited contamination; it does not justify singling out fresh milk.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | some concerns |
| Precision of results | low |
| Directness | direct |
| Reproducibility | unknown |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Representative national monitoring; exposure assessment.
15. Linked fact checks
- Milk is a 'substitute for blood' and carries every hormone, pesticide and antibiotic the animal received; therefore milk must be avoided. – Studies with mixed or unclear results
- Fresh milk, yogurt (incl. laban rayeb, ayran, labneh) and white/cottage cheese are harmful and must be avoided, whereas aged cheeses (cheddar, mozzarella, romi), processed cheese triangles, cream (qeshta), butter and ghee are allowed. – Studies contradicting or limiting the claim