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Allergy and Immunology Fellowship


Children's Hospital Colorado in Aurora, Colorado

Program Overview

Our program is primarily based at Children’s Hospital Colorado (CHCO), with adult clinics and consultative services at the University of Colorado Hospital (UCH), both are based at the Anschutz Medical Campus in Aurora, Colorado. This is an ACGME-accredited, University of Colorado Program, Allergy and Immunology Fellowship based at Children’s Hospital Colorado (Program Number 0200700087).

Children’s Hospital Colorado has been consistently ranked in the top 10 Children’s Hospital’s in the United States.  In addition to being one of the newest Children’s Hospitals, it is among the largest and has a large catchment area with no other major Children’s Hospitals within a 500-mile radius.  

Although both the Allergy/Immunology Section and its Allergy/Immunology Fellowship are new, our program is comprised of 10 primary Pediatric faculty (3 being Clinical Immunologists) and 3 primary Internal Medicine faculty at the UCH campus.  Our faculty have over 100 years of combined experience in every facet of Allergy and Immunology.


Goals of the Fellowship Program

  1. To provide comprehensive state-of-the-art clinical training in allergy and clinical immunology.  Emphasis will be placed on the common atopic disorders, such as asthma, allergic rhinitis, food allergy, and atopic dermatitis, in addition, to drug and vaccine allergy, insect venom allergy, urticaria, angioedema mastocytosis and eosinophilic gastrointestinal diseases.  Emphasis will be placed on both primary and secondary immunodeficiencies, in addition to exposure to autoimmune diseases. 
  2. To develop a solid foundation in the principles of basic immunology, which is fundamental to understanding and managing immune-mediated disorders. 
  3. To build a foundation for clinical, translational or basic research.  Emphasis will be placed on study design, data analysis, presentations, publication and preparation for funding.  This experience is intended to provide the base for career development in either clinical practice or academic medicine.


First Year of Fellowship

Much of the first year of fellowship will be devoted to direct clinical care.  First Year Fellows will spend most of their time in several outpatient clinic settings, among them being General Allergy clinics, Pediatric and Adult Continuity clinics, and the Immunodeficiency clinic.  In addition, fellows will attend a number of elective clinics including Pulmonary, Rheumatology, Dermatology, ENT, and the Eosinophilic Gastrointestinal Diseases clinic. 

The outpatient experience is balanced with participation in the inpatient-based Allergy and Immunology Consult service.  First Year Fellows will cover the consult service with Attending supervision alternating every two months for a total of six months for the year. 

Lastly, each First Year Fellow will have a 3-month research block in the second half of their first year, where they will have protected time to find an area of interest, speak with potential research mentors in the area they want to pursue, pick a research project and begin to develop their research projects.


Outpatient Clinics

  1. Pediatric Continuity Clinic.  This half-day clinic per week is held every Wednesday AM for the two years of fellowship.  Fellows will have the opportunity to follow a cohort of patients for up to 2 years.  The major goals is to gain experience and expertise in the diagnosis and management of common pediatric allergic diseases which include but are not limited to: pediatric asthma, atopic dermatitis, food allergy, viral-induced wheeze, medication allergies, acute and chronic urticaria, allergic rhinitis, anaphylaxis, and sinusitis and to develop the procedural skills required of an Allergist/Immunologist which includes the performance of and/or interpretation of epicutaneous skin testing with antigen, lung function testing, asthma biomarkers, allergen immunotherapy, and food and drug challenge testing
  2. Adult Continuity Clinic.  For this half-day clinic/per week over the two years of the fellowship, our fellows will develop expertise in caring for adults with allergic and immunologic diseases.  Each Fellow will be precepted by all three of the Attendings in 4-month blocks over two years.  This will provide an opportunity for each fellow to gain knowledge from each of the Attendings as they all have different clinical and research interests.  This clinic is based at UCH, which is adjacent to CHCO.  They will care for a cohort of their own patients for up 2 years.  They will become familiar with the diagnosis and management of adults with: both childhood-onset and adult-onset asthma, triad asthma, allergic bronchopulmonary aspergillosis, patients with fixed obstructive lung disease, chronic rhinosinusitis, drug allergy, insect sting allergy, hereditary angioedema, and both primary and acquired immunodeficiencies.  A procedural skill unique to this clinic is the performance of aspirin challenges/desensitizations in patients with triad asthma.
  3. Immunodeficiency Clinic.  This one half-day clinic will be attended by every fellow for each year of fellowship.  Fellows will be develop expertise in the underlying immune defects, the diagnosis, and management of a number of immunodeficiency disorders including B-cell and T-cell immunodeficiencies, severe combined immunodeficiency, complement component deficiencies, and abnormalities of neutrophil number and/or function.  Experience in AIDS and transplantation immunology will also be gained.  Procedural skills unique to this rotation include performing and interpreting delayed type hypersensitivity testing and the administration of intravenous gammaglobulin and other biologics.
  4. General Allergy Clinics.  The number of General Allergy Clinics will range from none during the 3-month research block to 5 one-half day clinics/week.  It is designed to have the Fellows work directly with all of the Attendings in their clinics.  This will provide the fellows a chance to see how each faculty member approaches allergic and immunologic diseases and also to gain from their unique and extensive knowledge of their specific interests.  In addition to diseases encountered in the Pediatric Continuity Clinic, fellows will evaluate and manage patients with confounders of asthma such as vocal cord dysfunction, gastroesophageal reflux disease and bronchiolitis obliterans.  In addition, fellows will gain expertise in allergic diseases including rhinitis, chronic rhinosinusitis, nasal polyposis, food allergy, atopic dermatitis, anaphylaxis, urticaria/angioedema, allergic bronchopulmonary aspergillosis, hypersensitivity pneumonitis, eosinophilia, and drug allergy.  Procedural skills unique to this rotation include drug and vaccine allergy testing and drug and vaccine challenges.
  5. Specialty Clinics
      1. Pulmonar
      2. Rheumatology
      3. Dermatology
      4. ENT
      5. Eosinophilic Gastrointestinal Disorders Clinic


Inpatient Allergy/Immunology Consult Service

This is a 6-month clinical rotation during the first year in 2-month blocks.  The emphasis during this rotation will be on specialty consultation within a large, full-service academic Children's Hospital.  During this rotation, the fellow will carry the Consult pager.  The fellow will be responsible for answering calls from referring physicians within the region who seek advise on their patients with allergic and immunologic disease.  They will also perform Allergy/Immunology consults on the inpatient units.  An Attending will always be available to supervise all consults and will be available to provide guidance with any telephone calls the fellow may receive.  Procedural skills unique to this rotation include drug desensitization.


Research/Other Scholarly Activity

During this 3-month block of protected time during the second half of the fellows’ first year, the fellows are expected to: 1.  Identify a research project and research mentor; 2. Complete any orientation or safety procedures in the laboratory and/or clinical research settings, as applicable, and 3.  Write a research proposal for submission and presentation to the faculty by June of their first year.  It is during this block of time, that the fellow can also spend time performing other Scholarly activities such as preparing for the in-training exam, working on formal presentations, and their research presentation.

Second Year of Fellowship

The second year is largely focused on research and other scholarly activities. Second year fellows will continue to attend the Pediatric and Adult Continuity Clinics as well as the Immunodeficiency clinic.  They will also spend one month performing consults on hospitalized adults with allergic and immunologic diseases at the UCH under the direct supervision of the adult allergists at UCH. 

Every Second Year Fellow is expected to present their research at a regional or national meeting and have a manuscript ready for submission by the end of their Second Year.  They will also be encouraged to write case reports, and to assist the Attendings in writing book chapters and topical reviews.


Outpatient Clinics

The major clinical goal during the second year is for the fellow to develop increasing expertise in the diagnosis and management of allergic and immunologic disorders in both children and adults.  They will attend three one half day clinics during their second year, which includes attending their Pediatric and Adult Allergy Continuity Clinics, and the Immunodeficiency Clinic where they are expected to follow all patients they cared for during their first year.


Inpatient Experience

Each fellow will spend one month on the Adult Allergy Consult Service at UCH.  During this rotation, fellows will develop knowledge and skills in working with and instructing primary care providers in adult allergy, asthma, and immunology care.  They will continue to develop expertise in interacting, as a consultant with primary care providers including general internists, internal medicine residents and Fellows, family practice residents, physician's assistants, medical students, and nurses. Fellows will provide consultation for patients admitted with immunologic, allergic and asthmatic diseases, with an Attending from the UCH always available for guidance and backup of all consults.  Unique procedures to this rotation include performing both drug and aspirin desensitizations.



A high quality clinical (or basic science) research experience is the major goal of the second year of fellowship, and will account for the majority the Fellow’s efforts.  Fellows will present research at laboratory meetings, meet with their research mentors on regular basis, submit an abstract and present their research project at a national meeting.  They will prepare a manuscript for publication, and fellows interested in a career in Academic Medicine will begin planning on submitting grants and/or Career Development Awards with assistance from their Research Mentor.


Other Scholarly Activities

Second year Fellows will also have a greater percentage of time devoted to Other Scholarly Duties.  Some of their time will be devoted to preparing lectures; they will attend all regularly scheduled lectures and attend conferences/lectures that are relevant to their research project.  Fellows are also expected to assist in the preparation of review articles and book chapters with the assistance of Attending mentors (clinical and research), and they will be actively involved in teaching first year fellows and pediatric residents who rotate through CHCO.  They will also have time to study for the in-training exam in the spring of the second year (a higher score compared to their first year’s score is expected) and to prepare for the ABAI Board Exam in the fall after their graduation.

Application Process: Pediatrics Allergy and Immunology Fellowship Program


The ACGME-accredited University of Colorado Program in Allergy and Immunology is based at Children's Hospital Colorado.  Applications are accepted through the Electronic Residency Application Service (ERAS).


Application Checklist

  1. ERAS application
  2. Personal Statement
  3. Curriculum Vitae
  4. USMLE Part 1, 2, and 3 scores if taken
  5. Medical school transcripts
  6. Three letters of recommendation
  7. Next Positions Available: 2

Important Dates

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For addtional Questions please contact: 

Program Director
Joseph Spahn, MD


Program Coordinator
Flor Ibarra
Phone: (720) 777-2195

 Allergy and Immunology Fellows


​2nd Year Fellows

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Ryan Israelsen, MD

Residency: University of Pittsburgh Medical Center
Medical School: University of Utah
School of Medicine
Research Interest: TBD

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Katherine McCormack, MD

Residency: University of Michigan
Medical School: Temple University
School of Medicine
Research Interest: TBD

​1st Year fellows

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Hannah Duffey, MD

Residency:  University of Utah

Medical School:  Creighton University School of Medicine

Research Interest: TBD


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Allison Hicks, MD

Residency:  University of Colorado

Medical School:  Creighton University School of Medicine

Research Interest: TBD