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Evan Martin Bloch, M.B.Ch.B., M.S.

Headshot of Evan Martin Bloch
  • Associate Professor of Pathology

Languages: English, Afrikaans, Spanish



Research Interests

Neglected Infectious diseases; transfusion transmitted infectious; Babesia; Zika more


Dr. Bloch is originally from South Africa where he completed his medical school (University of Cape Town) and clinical training. Following completion of a combined residency in Anatomic and Clinical Pathology (Tufts Medical Center), post-graduate fellowship in Transfusion Medicine (University of California San Francisco [UCSF]) and Masters in Global Health (UCSF) he continued research at Blood Systems Research Institute, while continuing to teach at UCSF in Laboratory Medicine and Global Health Sciences. He joined the faculty at Johns Hopkins University in the Department of Pathology in 2015.

Dr. Bloch's major research focus is in neglected and emerging infectious diseases particularly in the context of blood transfusion safety. He has a longstanding interest in babesiosis, a tick-borne parasitic infection that is endemic to parts of the United States. Babesia is globally ubiquitous, yet lack of awareness, in part due to historically limited diagnostic tools, has impeded greater recognition of its role in human disease. Dr. Bloch has participated in studies to develop both antibody and molecular tests for detection of Babesia. The studies have also been used to understand the biology of Babesia infection as well as to conduct surveillance outside of the US.

The author of 58 peer-reviewed publications, Dr. Bloch is an active member of the International Society of Blood Transfusion infectious disease working party (co-chair parasite sub-group) and AABB (formerly American Association of Blood Banks). He has consulted on transfusion policy and development of clinical transfusion guidelines, and hopes to use blood transfusion as a platform for infectious disease surveillance so as to guide programmatic support, particularly in low-resource settings. more


  • Associate Professor of Pathology

Departments / Divisions



  • MBChB MS; University of Cape Town Medical School (1999)


  • Anatomic and Clinical Pathology; Tufts-New England Medical Center Hospitals (2008)


  • University of California San Francisco School of Medicine (2009)

Board Certifications

  • American Board of Pathology (Anatomic & Clinical Pathology) (2008)
  • American Board of Pathology (Blood Banking/Transfusion Medicine) (2009)

Research & Publications

Research Summary

Primary Focus

  • Epidemiology and intervention trials focused on neglected (e.g. Babesia) and emerging (eg. Zika) infectious disease, specifically in the context of blood transfusion safety
  • Clinical and operational blood safety in low resource settings

Selected Publications

Bloch EM, Ness PM, Tobian AAR, Sugarman J. Revisiting Blood Safety Practices Given Emerging Data about Zika Virus. N Engl J Med 2018;378: 1837-41

Bloch EM, Mabula K, Levin A, Mrango Z, Weaver J, Munoz B and West SK. Babesia microti and Malaria infection in Africa: a pilot serosurvey in Kilosa district, Tanzania. American Journal of Tropical Medicine and Hygiene April 2018

T Brooks T, Roy-Burman A, Tuholske C, Busch MP, Bakkour S, Stone M, Linnen JM, Gao K, Coleman J, and Bloch EM. Evolution of Zika virus outbreak on Roatán, Honduras: A real-time observation of the epidemic. Emerg Infect Dis 2017;23

Bloch EM, Lee TH, Krause PJ, Telford SR 3rd, Montalvo L, Chafets D, Usmani-Brown S, Lepore TJ, Busch MP. Development of a real-time polymerase chain reaction assay for sensitive detection and quantitation of Babesia microti infection. Transfusion 2013;53: 2299-306

Bloch EM, Simon, MS and Shaz, BH. Emerging Infections and Blood Safety in the 21st Century. Ann Intern Med Mar 15 2016

Activities & Honors


  • AABB (Formerly American Association of Blood Banks)
  • ISBT (International Association of Blood Transfusion)

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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