Departments and Services | For Patients | Research & Trials | Education | Find a Doctor

Division of Infectious Disease
Division of Infections Disease
Fellowship Program
Clinical Programs
Penn CDC Prevention Epicenters Program
Clinical Trials
Botswana-UPenn Partnership
Adjunct Faculty
Administrative Contacts
Outpatient Clinics


faculty photo

Katharine J Bar, MD

Assistant Professor of Medicine
Attending Physician, Infectious Diseases, Hospital of the University of Pennsylvania
Department: Medicine

Contact information
502 D Johnson Pavilion
3610 Hamilton Walk
Philadelphia, PA 19104-6073
Office: (215) 573-8497
Fax: (215) 349-5111
Graduate Group Affiliations
BA (Biochemistry and African History, Honors)
Northwestern University, Evanston, IL, 1997.
University of Iowa College of Medicine, Iowa City, IA, 2002.
Post-Graduate Training
Intern and Resident, Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA, 2002-2005.
Chief Medical Resident, Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA, 2005-2006.
Fellow Division of Infectious Diseases, Department of Medicine, University of Alabama School of Medicine, Birmingham, AL, 2006-2009.
Clinical and PostDoctoral Research Fellow, Division of Infectious Diseases, Department of Medicine, University of Alabama School of Medicine, Birmingham, AL, 2007-2009.
Chief Fellow Division of Infectious Disease, Department of Medicine, University of Alabama School of Medicine, Birmingham, AL, 2008-2009.
Diplomate, National Board of Medical Examiners, 2003.
Diplomate, American Board of Internal Medicine, No. 265961, 2005.
Diplomate, American Board of Internal Medicine, Subspecialty Board, Infectious Disease, No. 265961, 2009.
Permanent link
> Perelman School of Medicine   > Faculty   > Details

Description of Clinical Expertise

HIV care, general infectious disease care

Description of Research Expertise

We study the basic mechanisms of transmission, pathogenesis and persistence in HIV and other chronic viral infections.

Current projects include:

1. The HIV transmission bottleneck and virus phenotype in injection drug users

2. The viral dynamics of rebound viremia upon cART interruption, both in the presence and absence of treatment and curative strategies

3. The neutralization properties of SIV challenge swarms and their transmitted/founder viruses

4. The genetic signatures of Herpes Simplex Virus immune escape from vaccine pressure

Lab Personnel:

Benjamin Scheinfeld, technician
D. Brenda Salantes, graduate student

Selected Publications

Sterret S, Edlefsen PT, Learn GH, Haynes BF, Hahn BH, Shaw GM and Bar KJ: Low multiplicity of HIV-1 infection and no vaccine enhancement in VAX003 injection drug users. Open Forum Infect Dis 1(2), 2014.

Li H, Blair L, Chen Y, Learn G, Pfafferott K, John M, Bhattacharya T, Hahn BH, Mallal S, Shaw GM and Bar KJ: Molecular mechanisms of HIV-1 prophylaxis failure revealed by single genome sequencing. J Inf Dis 208(10): 1598-1603, November 2013.

Lopker M, Easlick J, Sterrett S, Decker JM, Barbian, Learn G, Keele BF, Robinson JE, Li H, Hahn BH, Shaw GM and Bar KJ : Heterogeneity in neutralization sensitivity of viruses comprising the simian immunodeficiency virus SIVsmE660 isolate and vaccine challenge stock. J Virol 87(10): 5477-92, May 2013.

Song H, Pavlicek JW, Cai F, Bhattacharya T, Li H, Iyer SS, Bar KJ, Decker JM, Goonetilleke N, Liu MK, Berg A, Hora B, Drinker MS, Eudailey J, Pickeral J, Moody MA, Ferrari G, McMichael A, Perelson AS, Shaw GM, Hahn BH, Haynes BF, Gao F: Impact of immune escape mutations on HIV-1 fitness in the context of the cognate transmitted founder/genome. Retrovirology 9(89): 1742-4690, Oct 2012.

Bar KJ, Tsao C, Iyer SS, Decker JM, Yang Y, Bonsignori M, Chen X, Hwang K, Montefiori DC, Liao H, Hraber P, Fischer W, Li H, Wang S, Sterett S, Keele BF, Ganusov VV, Perelson AS, Korber BT, Georgiev I, McLellan JS, Pavlicek JW, Gao F, Haynes BF, Hahn BH, Kwong PD, and Shaw GM: Early Low-Titer Neutralizing Antibodies Impede HIV-1 Replication and Select for Virus Escape. PLoS Pathogens 8(5): e1002721, May 2012.

Liao H, Chen X, Munshaw S, Zhang R, Marshall DJ, Vandergrift N, Whitesides JF, Lu X, Yu J, Hwang K, Gao F, Markowitz M, Heath SL, Bar KJ, Goepfert P, Montefiori D, Shaw GM, Alam M, Margolis D, Denny TN, Boyd SD, Marshal E, Egholm M, Simen B, Hanczaruk B, Fire AZ, Voss G, Kelsoe G, Tomaras G, Moody MA, Kepler TB, and Haynes BF: Initial Antibodies to Transmitted HIV-1 gp41 Env are Polyreactive and Have Characteristics of Origin from Mutated Memory B Cells. J Exp Med 208(11): 2237-49, October 2011.

Bar KJ, Li H, Chamberland A, Tremblay C, Routy JP, Grayson T, Sun C, Learn GH, Morgan CJ, Schumacher JE, Haynes BF, Keele BF, Hahn BH and Shaw GM: Wide Variation in the Multiplicity of HIV-1 Infection Among Injection Drug Users. J Virol 84(12): 6421-6427, June 2010.

Li H, Bar KJ, Wang S, Decker JM, Chen Y, Sun C, Salazar-Gonzales JF, Salazar MG, Learn GH, Morgan CJ, Schumacher JE, Hraber P, Giorgi EE, Bhattacharya T, Korber BT,Perelson AS, Eron J, Cohen MS, Hicks CB, Haynes BF, Markowitz M, Keele BF, Hahn BH and Shaw GM : High Multiplicity Infection by HIV-1 in Men Who Have Sex with Men. PLoS Pathogens 6(5): e10000890, May 2010.

Salazar-Gonzalez JF, Salazar MG, Keele BF, Learn GH, Giorgi EE, Li H,Decker JD, Wang S, Baalwa J, Kraus M, Parrish N, Shaw K, Guffey MB, Bar KJ, Davis K, Ochsenbauer-Jambor C, Kappes J, Saag M, Cohen M, Mulenga J, Derdeyn C, Allen S, Hunter E, Markowitz M, Hraber P, Perelson A, Bhattacharya T, Haynes B, Korber B, Hahn BH and Shaw GM: Genetic Identity, Biologic Phenotype and Evolutionary Pathways of Transmitted/Founder Viruses and Their Progeny in Acute and Early HIV-1 Infection. J Exp Med 206: 1273-1289, June 2009.

Bar K, Wisplinghoff H, Wenzel RP, Bearman ML, and Edmond MB: Systemic Inflammatory Response Syndrome in Adult Patients with Nosocomial Bloodstream Infections due to Enterococci. BMC Infectious Diseases 6: 145, Sep 2006.

back to top
Last updated: 03/18/2015
The Trustees of the University of Pennsylvania