Microbiology and Immunology

B.S. Department of Molecular Biology and Biochemistry · UC Irvine · 2026-2027 Catalog

Microbiology and immunology are well-established disciplines within the life sciences. Microbiology addresses the biology of bacteria, viruses, and unicellular eukaryotes such as fungi and protozoa. Studies of microorganisms reveal basic information about processes in evolution, genetics, biochemistry, molecular biology, cell biology, structural biology, and ecology. Many bacteria, viruses, and protozoa cause disease in plants and animals. Hence, major areas of medicine and public health focus on these microorganisms.

Much of our knowledge in microbiology comes from the study of prokaryotic organisms, particularly bacteria. In addition to their relevance to infectious disease, these streamlined organisms provide a look at the basic requirements for life. The study of bacterial genetics has resulted in the creation of many genetic tools that are now used frequently to modify and study other organisms. Bacteria can also play an important role in the production of important materials such as biofuels and biopharmaceuticals. Understanding the behaviors of natural communities of bacteria and other organisms, called microbiomes, is an emerging field in our understanding of human health and disease.

The study of viruses (virology) is an important branch of microbiology that has contributed to our understanding of most of the fundamental processes in eukaryotic molecular biology, including the discovery of oncogenes. Viruses provide an excellent tool for the study of disease, cancer, and mechanisms of gene control. With the growing threat of emerging diseases, including global pandemics, and the potential for viral-based biological weapons, the study of virology has recently intensified and gained new perspectives.

Immunology encompasses efforts to understand how multicellular organisms have evolved to survive a variety of challenges to health and survival, including threats by pathogens and cancer cells. This includes an understanding of how the immune system develops, is activated, responds, and shuts down. Basic questions of how immunity functions are entwined with a fundamental understanding of the consequences of microbial infection, in a field called host-pathogen interactions. Immunology also encompasses the study of autoimmunity, the attack of the host by its own immune system, as well as the prevention of a response, known as immunological tolerance.

The major has been designed to span the interconnected disciplines of Microbiology and Immunology, and students have the opportunity to select courses from any of the following three areas: microbiology, immunology, or virology. The curricula overlap considerably, but there are unique courses for each discipline. The major is designed primarily for students who are serious about pursuing careers in microbiology and immunology and is intended to provide its graduates with the appropriate tools and training to successfully pursue professional and graduate degrees emphasizing these disciplines. These include Ph.D., M.D., and combined M.D./Ph.D. programs. Majoring in Microbiology and Immunology will also provide resources for serious students wishing to use a solid background in these disciplines for career goals in business, law, public and environmental policy, education, and other pursuits.

Admission

Application Process to Declare the Major: The major in Microbiology and Immunology is open to junior- and senior-level students only. Applications to declare the major can be made at the end of spring quarter, after all change of major requirements have been satisfied. Review of applications submitted at that time and selection to the major by the Microbiology and Immunology Faculty Board is completed during the summer. Information can also be found at the UCI Change of Major Criteria website. Double majors within the School of Biological Sciences or with Public Health Sciences, Biomedical Engineering: Premedical, Nursing Science, or Pharmaceutical Sciences are not permitted.

Requirements

All students must meet the University Requirements.
All students must meet the School Requirements.

Major Requirements for Microbiology and Immunology

CourseTitleUnits
A. Required Major Courses:
BIO SCI M112Microbiology and Immunology Seminar
BIO SCI M121Immunology with Hematology
BIO SCI M122General Microbiology
BIO SCI M124AVirology
B. Upper-Division Laboratories:
B1. Select one from the following:
BIO SCI M118LExperimental Microbiology Laboratory
BIO SCI M121LAdvanced Immunology Laboratory
B2. Select one from B1 or one from the following:
BIO SCI D111LDevelopmental and Cell Biology Laboratory
BIO SCI M114LBiochemistry Laboratory
BIO SCI M116LMolecular Biology Laboratory
BIO SCI M128LIntroductory Bioinformatics Lab
C. Upper-Division Biology Electives:
C1. Select at least four from the following:
BIO SCI D139Intercellular Signaling and Disease
BIO SCI E109Human Physiology
BIO SCI E126Parasitology
BIO SCI E134Microbiomes
BIO SCI M119Advanced Topics in Immunology
BIO SCI M124BViral Pathogenesis and Immunity
BIO SCI M125Molecular Biology of Cancer
BIO SCI M131Innate Immunity, Infection, and Pathogenesis
BIO SCI M137Microbial Genetics
BIO SCI M143Human Parasitology
BIO SCI M153Vascular Biology: Blood Vessels in Health and Disease
BIO SCI M180Biotechnological Applications of Energy and Environmental Research
BIO SCI N127Foundations in Neuroimmunology
PHRMSCI 170BMolecular Pharmacology II
C2. Select two from C1 or the following:
BIO SCI 105Introduction to STEM Education Research
BIO SCI D103Cell Biology
BIO SCI D104Developmental Biology
BIO SCI D137Eukaryotic and Human Genetics
BIO SCI D145Genomics, Development, and Medicine
BIO SCI E106Processes in Ecology and Evolution
BIO SCI M114Advanced Biochemistry
BIO SCI M116Advanced Molecular Biology
BIO SCI M123Introduction to Computational Biology
BIO SCI M133Structural Biology
BIO SCI M144Cell Organelles and Membranes
PHRMSCI 170AMolecular Pharmacology I
NOTE: No course may be used to satisfy more than one requirement.

Application Process to Declare the Major: The major in Microbiology and Immunology is open to junior- and senior-level students only. Applications to declare the major can be made at any time, but typically in the spring of the sophomore year. Review of applications submitted at that time and selection to the major by the Microbiology and Immunology Faculty Board is completed during the summer. Information can also be found at the UCI Change of Major Criteria website. Double majors within the School of Biological Sciences or with Public Health Sciences, Biomedical Engineering: Premedical, Nursing Science, or Pharmaceutical Sciences are not permitted.

Sample Program

Freshman

Fall Winter Spring
BIO SCI 2A BIO SCI 94 CHEM 1C& CHEM 1LC
BIO SCI 93 CHEM 1B STATS 7, 8, or MATH 5A (or General Education)
BIO SCI 90L Lower-Division Writing1 Lower-Division Writing1
CHEM 1A General Education

Sophomore

Fall Winter Spring
BIO SCI 97 BIO SCI 98 BIO SCI 99
CHEM 51A CHEM 51B& CHEM 51LB CHEM 51C& CHEM 51LC
CHEM 1LD MATH 5B (or General Education) General Education
MATH 5A or 5B (or General Education)

Junior

Fall Winter Spring
PHYSICS 3A PHYSICS 3B& PHYSICS 3LB PHYSICS 3C& PHYSICS 3LC
BIO SCI M124A U-D Bio Elective BIO SCI M122
BIO SCI 100 BIO SCI M121 U-D Biology Elective
BIO SCI 199 BIO SCI 199 BIO SCI 199

Senior

Fall Winter Spring
U-D Biology Elective U-D Biology Elective U-D Biology Elective
U-D Biology Lab U-D Biology Elective U-D Biology Lab
BIO SCI 199 BIO SCI 199 BIO SCI 199
  1. Students have the option of taking HUMAN 1AS, HUMAN 1BS, HUMAN 1CS or WRITING 40, WRITING 50, WRITING 60 in order to fulfill the lower-division writing requirement.

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