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Applied and Environmental Microbiology, December 2004, p. 7365-7371, Vol. 70, No. 12
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.12.7365-7371.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Milk Contamination and Resistance to Processing Conditions Determine the Fate of Lactococcus lactis Bacteriophages in Dairies

Carmen Madera, Cristina Monjardín, and Juan E. Suárez*

Area de Microbiología, Facultad de Medicina, Universidad de Oviedo, Oviedo, and Instituto de Productos Lácteos de Asturias (CSIC), Villaviciosa, Spain

Received 3 February 2004/ Accepted 5 August 2004

Milk contamination by phages, the susceptibility of the phages to pasteurization, and the high levels of resistance to phage infection of starter strains condition the evolution dynamics of phage populations in dairy environments. Approximately 10% (83 of 900) of raw milk samples contained phages of the quasi-species c2 (72%), 936 (24%), and P335 (4%). However, 936 phages were isolated from 20 of 24 (85%) whey samples, while c2 was detected in only one (4%) of these samples. This switch may have been due to the higher susceptibility of c2 to pasteurization (936-like phages were found to be approximately 35 times more resistant than c2 strains to treatment of contaminated milk in a plate heat exchanger at 72°C for 15 s). The restriction patterns of 936-like phages isolated from milk and whey were different, indicating that survival to pasteurization does not result in direct contamination of the dairy environment. The main alternative source of phages (commercial bacterial starters) does not appear to significantly contribute to phage contamination. Twenty-four strains isolated from nine starter formulations were generally resistant to phage infection, and very small progeny were generated upon induction of the lytic cycle of resident prophages. Thus, we postulate that a continuous supply of contaminated milk, followed by pasteurization, creates a factory environment rich in diverse 936 phage strains. This equilibrium would be broken if a particular starter strain turned out to be susceptible to infection by one of these 936-like phages, which, as a consequence, became prevalent.

* Corresponding author. Mailing address: Area de Microbiología, Facultad de Medicina, Universidad de Oviedo, Julián Clavería s. n., 33006 Oviedo, Spain. Phone: 34 985 103559. Fax: 34 985 103148. E-mail: evaristo{at}correo.uniovi.es.

Applied and Environmental Microbiology, December 2004, p. 7365-7371, Vol. 70, No. 12
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.12.7365-7371.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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