David A. Welsh, MD

Howard A. Buechner Professor of Medicine

Professor of Microbiology, Immunology and Parasitology

Professor, Alcohol and Drug Abuse Center

1901 Perdido Street,
MEB, Suite 3205

New Orleans, LA  70112

504.568.4634 [voice]

504.568.4295 [fax]



  • 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 pulmonary care for the Louisiana Department of Corrections as well as inpatient clinical care at LSU affiliated facilities.

Clinical Interests

  • HIV-Associated Lung Disorders
  • Lung Health during Incarceration

Research Interests

  • Maladaptive Health Behaviors (Alcohol, Tobacco, Substance Use)
  • Human Immunodeficiency Virus (HIV)
  • Lung Host Defense
  • Biological Age & Geriatric Syndrome Pathogenesis
  • Microbiota - Host Interactions
  • Inflamm-aging and Immunosenescence

Selected Publications

Wallace M, Felker-Kantor E, Madkour A, Ferguson T, Welsh D, Molina P, Theall KP. Adverse Childhood Experiences, Smoking and Alcohol Use, and Allostatic Load Among People Living with HIV. AIDS Behav. 2020 Jun;24(6):1653-1662. PubMed PMID: 31559525.

Simon L, Ferguson T, Vande Stouwe C, Brashear M, Primeaux SD, Theall KP, Welsh DA, Molina PE. Prevalence of Insulin Resistance in Adults Living with HIV: Implications of Alcohol Use. AIDS Res Hum Retroviruses. 2020 May 25;. doi: 10.1089/AID.2020.0029. [Epub ahead of print] 

Ferguson TF, Theall KP, Brashear M, Maffei V, Beauchamp A, Siggins RW, Simon L, Mercante D, Nelson S, Welsh DA, Molina PE. Comprehensive Assessment of Alcohol Consumption in People Living with HIV (PLWH): The New Orleans Alcohol Use in HIV Study. Alcohol Clin Exp Res. 2020 May 22. PubMed PMID: 32441814.

Ronis MJ, Mercer KE, Shankar K, Pulliam C, Pedersen K, Ingelman-Sundberg M, Friso S, Samuelson D, Del Valle L, Taylor C, Welsh DA. Potential role of gut microbiota, the proto-oncogene PIKE (Agap2) and cytochrome P450 CYP2W1 in promotion of liver cancer by alcoholic and nonalcoholic fatty liver disease and protection by dietary soy protein. Chem Biol Interact. 2020 May 14;325:109131. PubMed PMID: 32417163.

Ferguson TF, Rosen E, Carr R, Brashear M, Simon L, Theall KP, Ronis MJ, Welsh DA, Molina PE. Associations of Liver Disease with Alcohol Use among People Living with HIV and the Role of Hepatitis C: The New Orleans Alcohol Use in HIV Study. Alcohol Alcohol. 2020 Feb 7;55(1):28-36. PubMed PMID: 31812989.

Maffei VJ, Ferguson TF, Brashear MM, Mercante DE, Theall KP, Siggins RW, Taylor CM, Molina P, Welsh DA. Lifetime alcohol use among persons living with HIV is associated with frailty. AIDS. 2020 Feb 1;34(2):245-254. PubMed PMID: 31714352.

Ouhtit A, Thouta R, Zayed H, Gaur RL, Fernando A, Rahman M, Welsh DA. CD44 mediates stem cell mobilization to damaged lung via its novel transcriptional targets, Cortactin and Survivin. Int J Med Sci. 2020;17(1):103-111. eCollection 2020. PubMed PMID: 31929744.

Theall KP, Wallace M, Felker-Kantor E, Madkour AS, Brashear M, Ferguson T, Welsh D, Molina P. Neighborhood Alcohol Environment: Differential Effects on Hazardous Drinking and Mental Health by Sex in Persons Living with HIV (PLWH). AIDS Behav. 2019 Dec;23(12):3237-3246. PubMed PMID: 31401740.

Madkour AS, Felker-Kantor E, Wallace M, Ferguson T, Welsh DA, Molina PE, Theall KP. Latent Alcohol Use Typologies and Health Status Among a Cohort of Adults Living with HIV. Alcohol Alcohol. 2019 Dec 1;54(6):584-592. PubMed PMID: 31580404.

Samuelson DR, Siggins RW, Ruan S, Amedee AM, Sun J, Zhu QK, Marasco WA, Taylor CM, Luo M, Welsh DA, Shellito JE. Alcohol consumption increases susceptibility to pneumococcal pneumonia in a humanized murine HIV model mediated by intestinal dysbiosis. Alcohol. 2019 Nov;80:33-43. PubMed PMID: 30213614.

Watt J, Schuon J, Davis J, Ferguson TF, Welsh DA, Molina PE, Ronis MJJ. Reduced Serum Osteocalcin in High-Risk Alcohol Using People Living With HIV Does Not Correlate With Systemic Oxidative Stress or Inflammation: Data From the New Orleans Alcohol Use in HIV Study. Alcohol Clin Exp Res. 2019 Nov;43(11):2374-2383. PubMed PMID: 31483873.

Samuelson DR, Gu M, Shellito JE, Molina PE, Taylor CM, Luo M, Welsh DA. Intestinal Microbial Products From Alcohol-Fed Mice Contribute to Intestinal Permeability and Peripheral Immune Activation. Alcohol Clin Exp Res. 2019 Oct;43(10):2122-2133. PubMed PMID: 31407808.

Welsh DA, Ferguson T, Theall KP, Simon L, Amedee A, Siggins RW, Nelson S, Brashear M, Mercante D, Molina PE. The New Orleans Alcohol Use in HIV Study: Launching a Translational Investigation of the Interaction of Alcohol Use with Biological and Socioenvironmental Risk Factors for Multimorbidity in People Living with HIV. Alcohol Clin Exp Res. 2019 Apr;43(4):704-709. PubMed PMID: 30748025.

Lapinel NC, Jolley SE, Ali J, Welsh DA. Prevalence of non-tuberculous mycobacteria in HIV-infected patients admitted to hospital with pneumonia. Int J Tuberc Lung Dis. 2019 Apr 1;23(4):491-497. PubMed PMID: 31064629.

Jolley SE, Welsh DA. Substance use is independently associated with pneumonia severity in persons living with the human immunodeficiency virus (HIV). Subst Abus. 2019;40(2):256-261. PubMed PMID: 30883265.

NCBI Bibliography