Maghnus O'Seaghdha, PhD

Assistant Professor, Biology

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  • PhD in Microbiology, Trinity College
  • BA in Natural Sciences, Trinity College

Research Interests

Our laboratory is interested in the interactions between bacteria and their human host, particularly those interactions that may lead to opportunistic infections. Specifically, we are interested in the opportunistic Gram-positive pathogens, Streptococcus pyogenes (Group A Streptococcus or GAS) and Staphylococcus aureus. These bacteria often colonize asymptomatically; however, they have the ability to transition from the carrier state to cause serious, and sometimes life-threatening, infections. S. aureus is the leading cause of skin and soft tissue infections and GAS is responsible over 600 million cases of pharyngitis and an estimated 500,000 deaths annually. Current projects in the lab include: characterization of extra-nasal colonization by S. aureus, the global response of opportunistic pathogens to components of the human immune system and the mechanism of intracellular survival of bacteria in niche-specific tissue types. The overarching goal of our research is to better understand the triggers and mechanisms underlying opportunistic infections, which may inform developments in medical intervention.



  • 2018-Present: Faculty Life
  • 2017-2018: Educational Policy Committee (EPC)

Grants and Awards

  • Society for Applied and Environmental Microbiology (SfAM) Student Placement Scholarship
  • Suffolk University Summer Stipend Award
  • Suffolk University Course Development Award
  • Suffolk University Summer Stipend Award
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Courses Taught

  • BIO-111 – Introduction to the Cell
  • BIO-L111 – Introduction to the Cell (Lab)
  • BIO-285 – Microbiology
  • BIO-L285 – Microbiology (Lab)
  • BIO-377 – Immunology
  • BIO-385 – Advanced Microbiology
  • BIO-500 – Experiential Learning in Biology
  • BIO-510 – Independent Research
  • BIO-H511 – Honors Independent Research