• 2007 – Specialty in Infectious Diseases, INNSZ.
  • 2005 – Specialty in Internal Medicine, ABC Medical Center.
  • 2000 – Medicine, La Salle University.

Academic appointments:

  • Senior Researcher D at the HIV Clinic, Infectology Department of INCMNSZ.
  • It belongs to the National System of Researchers (SNI), level II.

Research interests:

  • Conduction of phase II to IV clinical trials of new antiretroviral treatment strategies or molecules
  • Management of advanced HIV disease and opportunistic infections.
  • Observational studies on HIV and its comorbidities.

Featured projects:

  • Participation as a co-investigator in Mexico for the Caribbean, Central America, and South America to the HIV epidemiology network (CCASAnet), experience in the direction and management of clinical trials.
  • Participation in international collaborations such as HIV: TB, IeDEA, ICONA, Fundación Hupedes, Kirby Institute, among others.


  • Increased Mortality after Tuberculosis Treatment Completion in Persons with HIV in Latin America. Koenig SP, Kim A, Shepherd BE, Cesar C, Veloso V, Cortes CP, Padgett D, Crabtree-Ramírez B, Gotuzzo E, McGowan CC, Sterling TR, Pape JW; Caribbean, Central and South America Network for HIV Epidemiology (CCASAnet). Clin Infect Dis. 2019 Oct 20.
  • HIV-related tuberculosis: mortality risk in persons without vs. with culture-confirmed disease. Crabtree-Ramírez B, Jenkins C, Jayathilake K, Carriquiry G, Veloso V, Padgett D, Gotuzzo E, Cortes C, Mejia F, McGowan CC, Duda S, Shepherd BE, Sterling TR. Int J Tuberc Lung Dis. 2019 Mar 1;23(3):306-314.
  • Mexico’s fragmented health system as a barrier to HIV care. Sierra-Madero JG, Belaunzaran-Zamudio PF, Crabtree-Ramírez B, Magis-Rodriguez C. Lancet HIV. 2019 Feb;6(2):e74-e75.
  • Diagnostic accuracy cohort study and clinical value of the Histoplasma urine antigen (ALPHA Histoplasma EIA) for disseminated histoplasmosis among HIV infected patients: A multicenter study. Torres-González P, Niembro-Ortega MD, Martínez-Gamboa A, Ahumada-Topete VH, Andrade-Villanueva J, Araujo-Meléndez J, Chaparro-Sánchez A, Crabtree-Ramírez B, Cruz-Martínez S, Gamboa-Domínguez A, Flores-Barrientos OI, Gaytán-Martínez JE, González-Hernández LA, Hernández-León C, Lozano-Fernandez VH, Manríquez-Reyes M, Magaña-Aquino M, Martínez-Ayala P, Ramírez-Hinojosa JP, Rangel-Cordero A, Rivera-Martínez NE, Reyes-Gutiérrez E, Reyes-Terán G, Rodríguez-Zulueta P, Ruíz-Quiñones J, Santiago-Cruz J, Velázquez-Zavala NG, Sifuentes-Osornio J, Ponce de León A. PLoS Negl Trop Dis. 2018 Nov 5;12(11):e0006872.
  • Trends in proportion of older HIV-infected people in care in Latin America and the Caribbean: a growing challenge. Caro-Vega Y, Belaunzarán-Zamudio PF, Crabtree-Ramírez B, Shepherd BE, Mejia F, Giganti MJ, Patterson P, Grinsztejn B, Wolff M, Pape JW, Padgett D, Castilho JL, McGowan C, Sierra-Madero JG. Epidemiol Infect. 2018 Jul;146(10):1308-1311.
  • Survival after cancer diagnosis in a cohort of HIV-positive individuals in Latin America. Fink VI, Jenkins CA, Castilho JL, Person AK, Shepherd BE, Grinsztejn B, Netto J, Crabtree-RamirezB, Cortés CP, Padgett D, Jayathilake K, McGowan C, Cahn P; CCASAnet. Infect Agent Cancer. 2018 May 8;13:16.
  • Differences in response to antiretroviral therapy in HIV-positive patients being treated for tuberculosis in Eastern Europe, Western Europe and Latin America. Caro-Vega Y, Schultze A, W Efsen AM, Post FA, Panteleev A, Skrahin A, Miro JM, Girardi E, Podlekareva DN, Lundgren JD, Sierra-Madero J, Toibaro J, Andrade-Villanueva J, Tetradov S, Fehr J, Caylà J, Losso MH, Miller RF, Mocroft A, Kirk O, Crabtree-Ramírez B. BMC Infect Dis. 2018 Apr 23;18(1):191.
  • HIV treatment eligibility expansion and timely antiretroviral treatment initiation following enrollment in HIV care: A metaregression analysis of programmatic data from 22 countries. Tymejczyk O, Brazier E, Yiannoutsos C, Wools-Kaloustian K, Althoff K, Crabtree-Ramírez B, Van Nguyen K, Zaniewski E, Dabis F, Sinayobye JD, Anderegg N, Ford N, Wikramanayake R, Nash D; IeDEA Collaboration. PLoS Med. 2018 Mar 23;15(3):e1002534.
  • Durability of Efavirenz Compared With Boosted Protease Inhibitor-Based Regimens in Antiretroviral-Naïve Patients in the Caribbean and Central and South America. Caro-Vega Y, Belaunzarán-Zamudio PF, Crabtree-Ramírez BE, Shepherd BE, Grinsztejn B, Wolff M, Pape JW, Padgett D, Gotuzzo E, McGowan CC, Sierra-Madero JG. Open Forum Infect Dis. 2018 Mar 2;5(3):ofy004.
  • Global Trends in CD4 Cell Count at the Start of Antiretroviral Therapy: Collaborative Study of Treatment Programs. IeDEA and COHERE Cohort Collaborations. Clin Infect Dis. 2018 Mar 5;66(6):893-903. doi: 10.1093/cid/cix915. Free PMC Article Similar articles Select item 2880774014. Outcomes of HIV-positive patients with cryptococcal meningitis in the Americas. Crabtree Ramírez B, Caro Vega Y, Shepherd BE, Le C, Turner M, Frola C, Grinsztejn B, Cortes C, Padgett D, Sterling TR, McGowan CC, Person A. Int J Infect Dis. 2017 Oct;63:57-63.
  • PMID: Time to HAART Initiation after Diagnosis and Treatment of Opportunistic Infections in Patients with AIDS in Latin America. Crabtree-Ramírez B, Caro-Vega Y, Shepherd BE, Grinsztejn B, Wolff M, Cortes CP, Padgett D, Carriquiry G, Fink V, Jayathilake K, Person AK, McGowan C, Sierra-Madero J; Caribbean, Central and South America Network for HIV Epidemiology (CCASAnet), of the International Epidemiologic Databases to Evaluate AIDS (IeDEA) Program. PLoS One. 2016 Jun 7;11(6):e0153921.