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Bacteriophage treatment decontaminates infant formula

Date:
October 23, 2015
Source:
American Society for Microbiology
Summary:
A phage showed strong anti-microbial activity against a type of food-borne bacterium that often kills infants after infecting them via infant formula. Phages are viruses that infect only bacteria.
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A phage showed strong anti-microbial activity against a type of food-borne bacterium that often kills infants after infecting them via infant formula. Phages are viruses that infect only bacteria. The research is published Oct. 23 online in Applied and Environmental Microbiology, a journal of the American Society for Microbiology.

In the study, the phage, called "CR5," showed high antimicrobial activity against the bacterium, Cronobacter sakazakii, as well as against several other species of Cronobacter, which can also cause dangerous illness, said coauthor Sangryeol Ryu, professor in the Department of Agricultural Biotechnology, Research Institute of Agriculture and Life Sciences, Seoul National University, Korea.

The research was conducted using infant formula that had been contaminated with C. sakazakii. "Interestingly, CR5 killed C. sakazakii quickly, and no C. sakazakii was detected in the infant formula after 10 hours had passed," said Ryu.

Ryu said that the phage is safe for humans, noting that his analysis of its genome revealed neither toxin gene nor virulence factor. In 2006, the US Food and Drug Administration approved the use of bacteriophages as biocontrol agents in foods. But the agency does not allow the use of antibiotics in infant formula.

Bacteriophages are abundant in the environment, which means they are ecologically friendly, said Ryu. "They infect and kill only bacteria, which means they could be used as novel biocontrol agents and even as natural food preservatives," he added, noting that other food-borne pathogens could also be controlled, by other types of phages.

Cronobacter, the target bacterial genus of the phage, CR5, is a family of closely related species that cause illness in people of all ages. While infection is rare in the US, these bacteria kill up to 40 percent of infected infants. Additionally, those that survive can face long-term neurological problems, according to the Centers for Disease Control and Prevention.

"Heretofore, C. sakazakii-contaminated infant formula has been considered an unsolved problem because antibiotics cannot be used," said Ryu, adding that C. sakazakii has been known to have multiple antibiotic resistance genes. "In this study, we proved that C. sakazakii-phage CR5 is an efficient biocontrol agent in infant formula. Therefore, this bacteriophage treatment is a promising approach to solve this problem."


Story Source:

Materials provided by American Society for Microbiology. Note: Content may be edited for style and length.


Journal Reference:

  1. Ju-Hoon Lee, Jaewoo Bai, Hakdong Shin, Yeran Kim, Bookyung Park, Sunggi Heu, Sangryeol Ryu. A Novel Bacteriophage TargetingCronobacter sakazakiiis a Potential Biocontrol Agent in Foods. Applied and Environmental Microbiology, 2015; AEM.01827-15 DOI: 10.1128/AEM.01827-15

Cite This Page:

American Society for Microbiology. "Bacteriophage treatment decontaminates infant formula." ScienceDaily. ScienceDaily, 23 October 2015. <www.sciencedaily.com/releases/2015/10/151023145112.htm>.
American Society for Microbiology. (2015, October 23). Bacteriophage treatment decontaminates infant formula. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2015/10/151023145112.htm
American Society for Microbiology. "Bacteriophage treatment decontaminates infant formula." ScienceDaily. www.sciencedaily.com/releases/2015/10/151023145112.htm (accessed May 23, 2017).

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