Carmen Tartera

United States Food and Drug Administration

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Mark K. Mammel

United States Food and Drug Administration

Jayanthi Gangiredla

Center for Food Safety and Applied Nutrition

Tammy J. Barnaba

Center for Food Safety and Applied Nutrition

David W. Lacher

Center for Food Safety and Applied Nutrition

Christopher A. Elkins

Centers for Disease Control and Prevention

Keith A. Lampel

United States Food and Drug Administration

Solomon T. Gebru

Center for Food Safety and Applied Nutrition

Isha R. Patel

United States Food and Drug Administration

J. Jofre

Universitat de Barcelona

Juan Jofre

Universitat de Barcelona

Cooperative Institutions

United States Food and Drug Administration

Center for Food Safety and Applied Nutrition

Food and Drug Administration

Universitat de Barcelona

University of Maryland, College Park

Johns Hopkins University

University of Maryland, Baltimore

National Institutes of Health

University of Pennsylvania

Center for Veterinary Medicine

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16 Methods for Detecting Microbial Pathogens in Food and Water

Methods in microbiology (1990)

Charles W. Kaspar Carmen Tartera

Isolation

Identification

Nucleic acid detection

Pathogenic bacteria

Food microbiology

10.1016/s0580-9517(08)70253-8

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Citations (30)

Culture and decontamination methods affecting enumeration of phages infecting Bacteroides fragilis in sewage

Applied and Environmental Microbiology (1992)

Carmen Tartera R. Araujo Tomas A. Michel J. Jofre

A new medium has been adapted for the growth of Bacteroides fragilis so that its phages can be recovered from environmental samples, and its efficiency has been assessed. Polyvinylidene difluoride membranes allow significantly higher recoveries among different membrane filters used to decontaminate the samples. In all cases, a number of phages remain in the filters and a percentage of them can be recovered by treatment with an eluant.

Bacteroides fragilis

Enumeration

Bacteroidaceae

Human decontamination

Membrane filter

10.1128/aem.58.8.2670-2673.1992

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Citations (78)

Draft Genome Sequences of Alternaria Strains Isolated from Grapes and Apples

Microbiology Resource Announcements (2020)

Solomon T. Gebru Jayanthi Gangiredla V.H. Tournas Carmen Tartera Mark K. Mammel

Here, we report the draft genome sequences of Alternaria alternata, isolated from seedless grapes, and Alternaria arborescens and Alternaria atra, isolated from Red Delicious apples, all from the Washington, DC, area.

10.1128/mra.01491-19

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Citations (6)

Draft Genome Sequences of 18 Streptococcus Strains Isolated from Live Dietary Supplements and Cultured Food Products

Microbiology Resource Announcements (2022)

Tammy J. Barnaba Jayanthi Gangiredla Mark K. Mammel David W. Lacher Carmen Tartera

We present the genome sequences of 18 Streptococcus isolates from 8 different dietary supplements and 9 cultured food products. Strains from this species naturally colonize the human mouth and upper respiratory tract. Studies have shown that S. thermophilus and S. salivarius strains confer oral health benefits to their host with little to no risk of pathogenic infection.

Streptococcus salivarius

10.1128/mra.00266-22

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Citations (2)

Use of Phenotypic MicroArray to Determine Culture Conditions that Regulate the Production of Shiga Toxin in Different Escherichia coli Pathotypes

2014 Annual Meeting (2014)

Carmen Tartera

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Aging-Induced Dysbiosis of Gut Microbiota as a Risk Factor for Increased Listeria monocytogenes Infection

Frontiers in Immunology (2021)

Mohammad Samiul Alam Jayanthi Gangiredla Nur A. Hasan Tammy J. Barnaba Carmen Tartera

Invasive foodborne Listeria monocytogenes infection causes gastroenteritis, septicemia, meningitis, and chorioamnionitis, and is associated with high case-fatality rates in the elderly. It is unclear how aging alters gut microbiota, increases risk of listeriosis, and causes dysbiosis post-infection. We used a geriatric murine model of listeriosis as human surrogate of listeriosis for aging individuals to study the effect of aging and L. monocytogenes infection. Aging and listeriosis-induced perturbation of gut microbiota and disease severity were compared between young-adult and old mice. Young-adult and old mice were dosed intragastrically with L. monocytogenes . Fecal pellets were collected pre- and post-infection for microbiome analysis. Infected old mice had higher Listeria colonization in liver, spleen, and feces. Metagenomics analyses of fecal DNA-sequences showed increase in α-diversity as mice aged, and infection reduced its diversity. The relative abundance of major bacterial phylum like, Bacteroidetes and Firmicutes remained stable over aging or infection, while the Verrucomicrobia phylum was significantly reduced only in infected old mice. Old mice showed a marked reduction in Clostridaiceae and Lactobacillaceae bacteria even before infection when compared to uninfected young-adult mice. L. monocytogenes infection increased the abundance of Porphyromonadaceae and Prevotellaceae in young-adult mice, while members of the Ruminococcaceae and Lachnospiraceae family were significantly increased in old mice. The abundance of the genera Blautia and Alistipes were significantly reduced post-infection in young-adult and in old mice as compared to their uninfected counterparts. Butyrate producing, immune-modulating bacterial species, like Pseudoflavonifractor and Faecalibacterium were significantly increased only in old infected mice, correlating with increased intestinal inflammatory mRNA up-regulation from old mice tissue. Histologic analyses of gastric tissues showed extensive lesions in the Listeria -infected old mice, more so in the non-glandular region and fundus than in the pylorus. Commensal species like Lactobacillus , Clostridiales , and Akkermansia were only abundant in infected young-adult mice but their abundance diminished in the infected old mice. Listeriosis in old mice enhances the abundance of butyrate-producing inflammatory members of the Ruminococcaceae / Lachnospiraceae bacteria while reducing/eliminating beneficial commensals in the gut. Results of this study indicate that, aging may affect the composition of gut microbiota and increase the risk of invasive L. monocytogenes infection.

Lachnospiraceae

Dysbiosis

10.3389/fimmu.2021.672353

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Citations (26)

Shiga Toxin Production by Different Escherichia coli Serotypes Grown under High Osmolarity Conditions

2015 Annual Meeting (July 25 - 28, 2015) (2015)

Carmen Tartera

Shiga-like toxin

Osmotic concentration

Source

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Production of Escherichia coli-specific hybridomas by using gnotobiotic mice

Applied and Environmental Microbiology (1990)

Carmen Tartera Kaitlin A. Davis Rita R. Colwell

Monoclonal antibodies provide a rapid and specific means of direct detection of microorganisms in water and food samples. However, monoclonal antibodies specific for some bacteria are difficult to obtain; a good example of such a bacterium is Escherichia coli. Gnotobiotic BALB/c mice immunized with whole-cell preparations of heat-treated strains of E. coli and subjected to high-frequency antigen injection showed a significant increase in the number of specific hybridomas produced. Fusions obtained by using regular BALB/c mice immunized by using standard immunization protocols produced nonspecific hybridomas. Twenty-one stable hybridomas that did not cross-react with Klebsiella pneumoniae ATCC 13883 or Citrobacter freundii 1604770 were obtained from gnotobiotic mice. The bacterial strains were selected for the specificity tests because of their high cross-reactivity, which has been detected in previous fusion experiments. The method of immunization described here offers the potential of improving the production of highly specific hybridomas for bacteria which have been difficult to obtain.

Citrobacter freundii

Citrobacter

10.1128/aem.56.5.1397-1399.1990

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Citations (1)

Fifty-Six Draft Genome Sequences of 10 Lactobacillus Species from 22 Commercial Dietary Supplements

Genome Announcements (2018)

Jayanthi Gangiredla Tammy J. Barnaba Mark K. Mammel David W. Lacher Christopher A. Elkins

Here, we present the genome sequences of 56 isolates of 10 species of the genus Lactobacillus that are considered beneficial components of the gut microbiota. The isolates examined were found in commercially available dietary supplements in the U.S. market.

Health Benefits

10.1128/genomea.00621-18

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Citations (4)