Marisa C Nielsen, PhD, D(ABMM)

Assistant Professor, Pathology & Laboratory Medicine

Marisa Nielsen


Marisa C. Nielsen received her B.S in Microbiology and her M.S. in Environmental Microbiology from University of Arizona. She spent nearly a decade working in clinical microbiology before deciding to pursue her PhD at University of California, Irvine. Afterwards, she completed her Clinical Microbiology Fellowship at University of Texas, Medical Branch. She is a certified Specialist in Microbiology by the American Society for Clinical Pathology and a board-accredited Diplomate of the American Board of Medical Microbiology. Her interests range from microbiome research to infectious diseases diagnostics and microscopy, with a specific focus on pathogens acquired from environmental exposures and the protective role of commensal organisms in the infection process.

Currently, she is an Assistant Professor for Pathology and Laboratory Medicine at Boston University Chobanian and Avedisian School of Medicine, the Assistant Director for Clinical Microbiology at Boston Medical Center, and holds a BU-BMC Cancer Center Faculty Appointment.


  • University of California, Irvine, PhD
  • University of Arizona, MS
  • University of Arizona, BS


  • Published on 3/23/2023

    Raymond CM, Nielsen MC, Silva C, Tanabe M, Clement C, Williams-Bouyer N, He J. Vacuoles in the Breast: A Histologic Clue for an Unusual Presentation of an Atypical Organism. Cureus. 2023 Mar; 15(3):e36586. PMID: 37095826.

    Read at: PubMed
  • Published on 3/4/2023

    Medeiros I, Vadlamudi C, Doonan K, Nielsen MC, Miller NS. Implementation of an HIV RNA Qualitative PCR Assay in an HIV Diagnostic Algorithm: A Single-Institution Experience. Am J Clin Pathol. 2023 Mar 04. PMID: 36869833.

    Read at: PubMed
  • Published on 1/18/2023

    Nielsen MC, Clarner P, Paroha R, Lee S, Thwe PM, Ren P. Comparison of Analytical Sensitivity (Limit of Detection) of Xpert MTB/RIF and Xpert MTB/RIF Ultra for Non-Sputum Specimens. Pathogens. 2023 Jan 18; 12(2). PMID: 36839429.

    Read at: PubMed
  • Published on 9/14/2022

    Nielsen MC, Clarner P, Ren P. Wrong Place at the Wrong Maritime. Clin Infect Dis. 2022 Sep 14; 75(5):907-909. PMID: 36108269.

    Read at: PubMed
  • Published on 7/20/2022

    Wang B, Pineda-Reyes R, Nielsen MC, Baillargeon G, Baillargeon JG, McDougal AN. Single-center investigation on central-line-associated bloodstream infections and blood-culture contamination during the early months of the coronavirus disease 2019 (COVID-19) pandemic. Infect Control Hosp Epidemiol. 2022 Jul 20; 1-3. PMID: 35856260.

    Read at: PubMed
  • Published on 7/5/2022

    Zhang JR, Kueht M, Lea AS, Stevenson HL, Gosnell J, Ren P, Nielsen MC, Miller A, Mujtaba M, Fair J. Multisite biologic tissue SARS-CoV-2 PCR testing in kidney transplantation from a COVID-positive donor. J Surg Case Rep. 2022 Jul; 2022(7):rjac314. PMID: 35813455.

    Read at: PubMed
  • Published on 5/9/2022

    Nielsen MC, Peterson JM, Shine B, Hornak JP, Esechie A, Bhatt S, Desai K, Dabi A, Felicella MM, Ren P. A Fatal Fungal Infection: Cryptococcus gattii (VGI) Meningitis in Texas. Open Forum Infect Dis. 2022 Jul; 9(7):ofac236. PMID: 35854998.

    Read at: PubMed
  • Published on 2/24/2022

    Nielsen MC, Machado RRG, Mitchell BM, McConnell AJ, Saada NI, Weaver SC, Ren P. A Comparison of Seegene Technologies Novaplex SARS-CoV-2 Variants I, II, and IV Assays with Spike Gene Sequencing for Detection of Known Severe Acute Respiratory Syndrome Coronavirus 2 Variants. J Mol Diagn. 2022 05; 24(5):455-461. PMID: 35218945.

    Read at: PubMed
  • Published on 7/19/2021

    Nielsen MC, Reynoso D, Ren P. The Brief Case: A Fatal Case of SARS-CoV-2 Coinfection with Coccidioides in Texas-Another Challenge We Face. J Clin Microbiol. 2021 07 19; 59(8):e0016321. PMID: 34279116.

    Read at: PubMed
  • Published on 7/19/2021

    Nielsen MC, Reynoso D, Ren P. Closing the Brief Case: A Fatal Case of SARS-CoV-2 Coinfection with Coccidioides in Texas-Another Challenge We Face. J Clin Microbiol. 2021 07 19; 59(8):e0016421. PMID: 34279118.

    Read at: PubMed

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