Response to Live Attenuated Influenza Vaccine in Tonsillar Tissues and Blood (FLU-Tonsil)

  • End date
    Dec 17, 2024
  • participants needed
  • sponsor
    Stanford University
Updated on 17 May 2022
trivalent influenza vaccine
live attenuated influenza vaccine
Accepts healthy volunteers


This is one project of a larger ongoing study related to the immune system's response to the flu virus. This study is designed to investigate the immune response to a nasal flu immunization in tonsillar tissue compared to what can be measured in the blood.


This is a Phase IV study of licensed influenza vaccines with up to 50 male and female volunteers, 2-49 years of age. Volunteers were patients undergoing tonsillectomy for treatment of obstructive sleep apnea (OSA) or other non-infectious indication as part of their routine medical care.

The investigator intends to collect blood and lymphoid tissues routinely discarded during surgery from adults and children after routine seasonal live attenuated influenza vaccination (LAIV) to determine how immune memory develops at the actual site of infection, and how immunization may alter this process.

The first research study visit will take place approximately 3-14 days prior to the scheduled date of tonsillectomy surgery. During this visit, 20 mL blood sample will be obtained and participants will receive FluMist (intranasal, quadrivalent, live-attenuated influenza vaccine). This is one of the routinely available and recommended vaccines for the age groups included in this study.

The second study visit will take place on the same day of the scheduled surgery for the tonsillectomy. Another blood sample (maximum volume of 20 mL) will be collected along with the discarded tonsillar tissue. Blood and tissues will be sent to the lab.

Condition Influenza
Treatment FluMist
Clinical Study IdentifierNCT03884296
SponsorStanford University
Last Modified on17 May 2022


Yes No Not Sure

Inclusion Criteria

2-49-year-old male and female patients undergoing tonsillectomy for obstructive sleep apnea or other non-infectious indication
Willing and able to complete the informed consent process
Availability for follow-up for the planned duration of the study

Exclusion Criteria

Prior off-study vaccination with seasonal influenza vaccine within three months of study vaccination
Life-threatening reactions to previous influenza vaccinations
Asthma (contraindication for receipt of LAIV4)
Allergy to egg or egg products or to vaccine components including gentamicin, gelatin, arginine or MSG
Active systemic or serious concurrent illness, including febrile illness on the day of vaccination
History of immunodeficiency (including HIV infection)
Known or suspected impairment of immunologic function; may include significant liver disease, diabetes mellitus treated with insulin or moderate to severe renal disease
Hospitalization in the past year for congestive heart failure or emphysema
Chronic Hepatitis B or C
Recent or current use of immunosuppressive medication, including systemic glucocorticoids (corticosteroid nasal sprays and topical steroids are permissible). Use of oral steroids (<20mg prednisone-equivalent/day) may be acceptable after review by the investigator
Participants in close contact with anyone who has a severely weakened immune system
Malignancy, other than squamous cell or basal cell skin cancer (includes solid tumors such as breast cancer or prostate cancer with recurrence in the past year, and any hematologic cancer such as leukemia)
Autoimmune disease (including rheumatoid arthritis treated with immunosuppressive medication such as Plaquenil, methotrexate, prednisone, Enbrel) which, in the opinion of the investigator might jeopardize volunteer safety or compliance with the protocol
History of blood dyscrasias, renal disease, or hemoglobinopathies requiring regular medical follow up or hospitalization during the preceding year
Use of any anti-coagulation medication such as Coumadin or Lovenox, or anti-platelet agents such as aspirin (except up to 325 mg. per day), Plavix, or Aggrenox will be reviewed by investigators to determine if study participation would affect the volunteer's safety or compliance with the protocol
Receipt of blood or blood products within the past 6 months or planned used during the study
A medical or psychiatric condition or occupational responsibilities that preclude participant compliance with the protocol
Receipt of an inactivated vaccine 14 days prior to study enrollment, or planned vaccinations prior to completion of last study visit (~ 14 days after study vaccination)
Receipt of a live, attenuated vaccine within 60 days prior to enrollment of planned vaccination prior to completion of last study visit (~ 14 days after study enrollment)
Need for allergy immunization (that cannot be postponed) until after the last study visit
History of Guillain-Barre# syndrome
Pregnant or breastfeeding woman
Use of investigational agents within 30 days prior to enrollment or planned use during the study
Donation of the equivalent of a unit of blood within 6 weeks prior to enrollment or donation of platelets within 2 weeks of enrollment or planned donation prior to completion of the last visit
Any condition which, in the opinion of the investigator, might interfere with volunteer safety, study objectives or the ability of the participant to understand or comply with the study protocol
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