KOREASCHOLAR

This study analyzed the microbial contamination on eggshells from Korean poultry farms and evaluated the growth kinetics of three Salmonella serovars (S. Enteritidis, S. Typhimurium, and S. Thompson) under various storage temperatures. Unwashed eggs showed aerobic plate counts of 3–4 log CFU/egg, with diverse dominant microflora including Corynebacterium, Bacillus, and Staphylococcus depending on the rearing environments. Although the absence of Salmonella indicates that production-stage hygiene management was maintained, potential risks during distribution could still arise if temperature control fails or cross-contamination occurs. The growth of Salmonella on eggshells was highly temperature-dependent. At 4℃ and 10℃, populations decreased significantly by 90% to over 99.9% due to cold stress, showing clear inhibition during long-term storage. Conversely, 15℃ and 20℃ served as critical threshold temperatures where the pathogens transitioned from reduction to proliferation, exhibiting distinct serovar-specific adaptation periods followed by rapid growth. At 30℃, all serovars proliferated rapidly to their maximum phases, increasing by up to 3.4 log CFU/egg compared to initial levels. In conclusion, although individual serovars show different responses to temperature stress, exposure above 15℃ stimulates rapid growth capable of causing foodborne illness. Therefore, maintaining a continuous cold chain from farms to consumers is essential.

Abstract
I. 서 론
II. 연구 내용 및 방법
    1. 시료 수집 및 난각 미생물의 정량 분석
    2. 난각 유래 미생물 분리 및 동정
    3. 시험균주 배양 및 균 접종
    4. 저장 온도에 따른 살모넬라균의 생육 분석 및 예측모델활용
    5. 통계 처리
III. 결과 및 고찰
    1. 농가 수집 달걀 표면 미생물 오염도 정량적 분석
    2. 달걀 표면 미생물총의 정성적 분포 특성
    3. 온도 및 저장기간에 따른 살모넬라균의 생육 변화와 예측모델링
IV. 결론 및 요약
감사의 글
Conflict of Interest
References

• 이은선(농촌진흥청 국립축산과학원 축산푸드테크과) | Eun-Seon Lee (Division of Animal Resources Food Tech, National Institute of Animal Science) Corresponding author
• 김부민(농촌진흥청 국립축산과학원 축산푸드테크과) | Bu-Min Kim (Division of Animal Resources Food Tech, National Institute of Animal Science)
• 김동균(농촌진흥청 국립축산과학원 축산푸드테크과) | Dong Gyun Kim (Division of Animal Resources Food Tech, National Institute of Animal Science)
• 강선문(농촌진흥청 국립축산과학원 축산푸드테크과) | Sun Moon Kang (Division of Animal Resources Food Tech, National Institute of Animal Science)