David A. Welsh, MD

Howard A. Buechner Professor of Medicine

Associate Professor of Clinical Medicine

Associate Professor of Microbiology, Immunology and Parasitology

1901 Perdido Street,
MEB, Suite 3205

New Orleans, LA  70112

504.568.4634 [voice]

504.568.4295 [fax]


Microbial Genomics Resource Group  

LSUHSC-NO Comprehensive Alcohol-HIV/AIDS Research Center

  • BA - Brandeis University, Waltham, MA
  • MD - University of Washington School of Medicine, Seattle, WA

Dr. Welsh received training in Internal Medicine at Vanderbilt University Medical Center before completing a fellowship in Pulmonary and Critical Care at LSU.  He oversees the HIV Chest Clinic and provides inpatient clinical care at LSU affiliated facilities.

Clinical Interests
  • HIV-Associated Lung Disorders
  • Lung Health during Incarceration
Research Interests
  • Resident Microbial Communities and Human Health & Aging
  • Resident Microbial Communities and Lung Host Defense
  • Inflamm-aging and Immunosenescence
  • Assessment of Biological Age
  • Human Immunodeficiency Virus (HIV)
  • Maladaptive Health Behaviors (Alcohol Use Disorders)
Selected Publications

Samuelson DR, Burnham E, Maffei VJ, Vandizier RW, Blanchard EE, Shellito JE, Luo M, Taylor CM, Welsh DA.  The respiratory tract microbial biogeography in alcohol use disorder.  Am J Physiol  Lung Cell Mol Physiol.  2018 Jan 1;314(1):L107.

PE Molina, L Simon, A Amedee, DA Welsh, T Ferguson. Impact of alcohol on HIV disease pathogenesis, comorbities and aging; integrating preclinical and clinical findings.  Alcohol and Alcoholism.  In Press 2018. 

Obanda, Diana; Ryan, Justin; Raggio, Anne; Husseneder, Claudia; Marx, Brian; Stout, Rhett;
 Welsh, David;
 Taylor, Christopher; Luo, Meng; Blanchard, Eugene; Bendiks, Zach; Diana;
 Keenan, Michael. CD obese-prone rats, but not obese-resistant, robustly ferment resistant starch without increased weight or fat accretion. Obesity.  2018 Mar;26(3):570.

Samuelson DR, Shellito JE, Maffei VJ, Tague ED, Campagna SR, Blanchard EE, Luo M, Taylor CM, Ronis MJJ, Molina PE, Welsh DA.  Alcohol-associated intestinal dysbiosis impairs pulmonary host defense against Klebsiella pneumoniae. PLoS Pathogens. 2017; 13(6):e1006426. 

Byerley LO, Samuelson D, Blanchard E 4th, Luo M, Lorenzen BN, Banks S, Ponder MA, Welsh DA, Taylor CM. Changes in the gut microbial communities following addition of walnuts to the diet. The Journal of nutritional biochemistry. 2017; 48:94-102.

Maffei VJ, Kim S, Blanchard E 4th, Luo M, Jazwinski SM, Taylor CM, Welsh DA.  Biological Aging and the Human Gut Microbiota. The journals of gerontology. Series A, Biological Sciences and Medical Sciences. 2017; 

Ruan S, Cai Y, Ramsay AJ, Welsh DA, Norris K, Shellito JE. B cell and antibody responses in mice induced by a putative cell surface peptidase of Pneumocystis murina protect against experimental infection. Vaccine. 2017; 35(4):672-679.

Goldsmith F, Guice J, Page R, Welsh DA, Taylor CM, Blanchard EE, Luo M, Raggio AM, Stout RW, Carvajal-Aldaz D, Gaither A, Pelkman C, Ye J, Martin RJ, Geaghan J, Durham HA, Coulon D, Keenan MJ. Obese ZDF rats fermented resistant starch with effects on gut microbiota but no reduction in abdominal fat. Molecular nutrition & food research. 2017; 61(1). 


NCBI Bibliography