Inhaled vs. Injected Pneumococcal Vaccine: Immunity Comparison
Author Information
Author(s): Gordon Stephen B., Malamba Rose, Mthunthama Neema, Jarman Elizabeth R., Jambo Kondwani, Jere Khuzwayo, Zijlstra Eduard E., Molyneux Malcolm E., Dennis John, French Neil
Primary Institution: Liverpool School of Tropical Medicine
Hypothesis
Does inhaled 23-valent pneumococcal polysaccharide vaccine induce better pulmonary mucosal immunoglobulin responses than injected vaccine?
Conclusion
Injected pneumococcal vaccine significantly increases immunoglobulin levels, while inhaled vaccine does not produce a similar response.
Supporting Evidence
- Injected vaccine produced significant increases in IgG and IgA levels in both serum and BAL.
- Inhaled vaccine did not result in significant increases in immunoglobulin levels.
- Participants receiving injected vaccine reported minor side effects, while inhaled vaccine also had side effects.
- Bronchoalveolar lavage showed that injected vaccine increased mucosal levels of IgG.
Takeaway
This study found that getting a pneumococcal vaccine through an injection helps your body make more protective antibodies than if you breathe it in.
Methodology
The study compared immunoglobulin responses in serum and bronchoalveolar lavage fluid from adults receiving either injected or inhaled pneumococcal vaccine.
Potential Biases
Potential bias in participant selection as only HIV-negative volunteers were included.
Limitations
The study did not assess upper airway responses and only included healthy volunteers without a history of pneumonia or asthma.
Participant Demographics
33 adult volunteers, no history of pneumonia or asthma, normal chest X-ray.
Statistical Information
P-Value
0.01, 0.001, 0.02
Confidence Interval
95%
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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