How Baseline Levels of CD4 T-Cells Affect Responses to Influenza Vaccines
Author Information
Author(s): He Xiao-Song, Holmes Tyson H., Sasaki Sanae, Jaimes Maria C., Kemble George W., Dekker Cornelia L., Arvin Ann M., Greenberg Harry B.
Primary Institution: Stanford University School of Medicine
Hypothesis
T-cell and antibody responses to influenza vaccines are functions of pre-existing host immunity against influenza antigens.
Conclusion
Baseline levels of influenza-specific CD4 T-cells significantly influence the immune response to influenza vaccination.
Supporting Evidence
- Baseline percentage of influenza-specific CD4 T-cells was identified as a significant correlate of T-cell responses.
- Lower baseline levels of CD4 T-cells were associated with larger T-cell responses.
- Baseline HAI titer and vaccine type were significant correlates for antibody response.
Takeaway
If you have more memory T-cells from past infections, your body might not respond as strongly to the flu vaccine, but if you have fewer, the vaccine can work better.
Methodology
Data on immune responses were collected from blood samples before and after vaccination in healthy children and adults, using regression analysis to identify baseline correlates.
Potential Biases
Potential biases may arise from the selection of participants and the specific strains of influenza used in the study.
Limitations
The study's findings may not be generalizable beyond the specific populations studied, and the sample sizes were relatively small.
Participant Demographics
Participants included healthy children aged 5-9 years and adults aged 22-49 years.
Statistical Information
P-Value
0.0003
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website