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Composition and Diversity of the Fecal Microbiome and Inferred Fecal Metagenome Does Not Predict Subsequent Pneumonia Caused by Rhodococcus equi in Foals.

Whitfield-Cargile CM, Cohen ND, Suchodolski J, Chaffin MK, McQueen CM, Arnold CE, Dowd SE, Blodgett GP - PLoS ONE (2015)

Bottom Line: We thus hypothesized that varying composition or reduced diversity of the intestinal microbiome of neonatal foals would contribute to increased susceptibility of their developing R. equi pneumonia.No significant differences were found among groups at either sampling time, indicating absence of evidence of an influence of composition or diversity of the fecal microbiome, or predicted fecal metagenome, on susceptibility to subsequent R. equi pneumonia.A marked and significant difference identified between a relatively short interval of time appeared to reflect ongoing adaptation to transition from a milk diet to a diet including available forage (including hay) and access to concentrate fed to the mare.

View Article: PubMed Central - PubMed

Affiliation: Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, United States of America.

ABSTRACT
In equids, susceptibility to disease caused by Rhodococcus equi occurs almost exclusively in foals. This distribution might be attributable to the age-dependent maturation of immunity following birth undergone by mammalian neonates that renders them especially susceptible to infectious diseases. Expansion and diversification of the neonatal microbiome contribute to development of immunity in the gut. Moreover, diminished diversity of the gastrointestinal microbiome has been associated with risk of infections and immune dysregulation. We thus hypothesized that varying composition or reduced diversity of the intestinal microbiome of neonatal foals would contribute to increased susceptibility of their developing R. equi pneumonia. The composition and diversity indices of the fecal microbiota at 3 and 5 weeks of age were compared among 3 groups of foals: 1) foals that subsequently developed R. equi pneumonia after sampling; 2) foals that subsequently developed ultrasonographic evidence of pulmonary abscess formation or consolidation but not clinical signs (subclinical group); and, 3) foals that developed neither clinical signs nor ultrasonographic evidence of pulmonary abscess formation or consolidation. No significant differences were found among groups at either sampling time, indicating absence of evidence of an influence of composition or diversity of the fecal microbiome, or predicted fecal metagenome, on susceptibility to subsequent R. equi pneumonia. A marked and significant difference identified between a relatively short interval of time appeared to reflect ongoing adaptation to transition from a milk diet to a diet including available forage (including hay) and access to concentrate fed to the mare.

No MeSH data available.


Related in: MedlinePlus

Principal coordinate analysis plots of the predicted metagenome for health groups at time 2 based on the Bray Curtis dissimilarity metric.Principal coordinate analysis of the Bray Curtis dissimilarity metric of the predicted metagenome for all heath groups; healthy (red), clinical (blue), subclinical (orange) at time 2. There were no differences among the groups.
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pone.0136586.g005: Principal coordinate analysis plots of the predicted metagenome for health groups at time 2 based on the Bray Curtis dissimilarity metric.Principal coordinate analysis of the Bray Curtis dissimilarity metric of the predicted metagenome for all heath groups; healthy (red), clinical (blue), subclinical (orange) at time 2. There were no differences among the groups.

Mentions: Principal coordinate analysis plots based on the Bray Curtis dissimilarity metric revealed no visual clustering of the predicted metagenome of the health groups at time 2 (Fig 5). ANOSIM analysis of the distance metrics revealed no significant difference in the predicted metagenome among the health groups at time 1 (R = 0.0149; P = 0.212). In addition, Kruskal-Wallis test revealed no significant differences in the abundance of any KEGG pathways among the health groups at time 2 (data not shown).


Composition and Diversity of the Fecal Microbiome and Inferred Fecal Metagenome Does Not Predict Subsequent Pneumonia Caused by Rhodococcus equi in Foals.

Whitfield-Cargile CM, Cohen ND, Suchodolski J, Chaffin MK, McQueen CM, Arnold CE, Dowd SE, Blodgett GP - PLoS ONE (2015)

Principal coordinate analysis plots of the predicted metagenome for health groups at time 2 based on the Bray Curtis dissimilarity metric.Principal coordinate analysis of the Bray Curtis dissimilarity metric of the predicted metagenome for all heath groups; healthy (red), clinical (blue), subclinical (orange) at time 2. There were no differences among the groups.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4549325&req=5

pone.0136586.g005: Principal coordinate analysis plots of the predicted metagenome for health groups at time 2 based on the Bray Curtis dissimilarity metric.Principal coordinate analysis of the Bray Curtis dissimilarity metric of the predicted metagenome for all heath groups; healthy (red), clinical (blue), subclinical (orange) at time 2. There were no differences among the groups.
Mentions: Principal coordinate analysis plots based on the Bray Curtis dissimilarity metric revealed no visual clustering of the predicted metagenome of the health groups at time 2 (Fig 5). ANOSIM analysis of the distance metrics revealed no significant difference in the predicted metagenome among the health groups at time 1 (R = 0.0149; P = 0.212). In addition, Kruskal-Wallis test revealed no significant differences in the abundance of any KEGG pathways among the health groups at time 2 (data not shown).

Bottom Line: We thus hypothesized that varying composition or reduced diversity of the intestinal microbiome of neonatal foals would contribute to increased susceptibility of their developing R. equi pneumonia.No significant differences were found among groups at either sampling time, indicating absence of evidence of an influence of composition or diversity of the fecal microbiome, or predicted fecal metagenome, on susceptibility to subsequent R. equi pneumonia.A marked and significant difference identified between a relatively short interval of time appeared to reflect ongoing adaptation to transition from a milk diet to a diet including available forage (including hay) and access to concentrate fed to the mare.

View Article: PubMed Central - PubMed

Affiliation: Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, United States of America.

ABSTRACT
In equids, susceptibility to disease caused by Rhodococcus equi occurs almost exclusively in foals. This distribution might be attributable to the age-dependent maturation of immunity following birth undergone by mammalian neonates that renders them especially susceptible to infectious diseases. Expansion and diversification of the neonatal microbiome contribute to development of immunity in the gut. Moreover, diminished diversity of the gastrointestinal microbiome has been associated with risk of infections and immune dysregulation. We thus hypothesized that varying composition or reduced diversity of the intestinal microbiome of neonatal foals would contribute to increased susceptibility of their developing R. equi pneumonia. The composition and diversity indices of the fecal microbiota at 3 and 5 weeks of age were compared among 3 groups of foals: 1) foals that subsequently developed R. equi pneumonia after sampling; 2) foals that subsequently developed ultrasonographic evidence of pulmonary abscess formation or consolidation but not clinical signs (subclinical group); and, 3) foals that developed neither clinical signs nor ultrasonographic evidence of pulmonary abscess formation or consolidation. No significant differences were found among groups at either sampling time, indicating absence of evidence of an influence of composition or diversity of the fecal microbiome, or predicted fecal metagenome, on susceptibility to subsequent R. equi pneumonia. A marked and significant difference identified between a relatively short interval of time appeared to reflect ongoing adaptation to transition from a milk diet to a diet including available forage (including hay) and access to concentrate fed to the mare.

No MeSH data available.


Related in: MedlinePlus