Immune Responses Linked to Early Clearance of Tuberculosis in Indonesia
Author Information
Author(s): Setiabudiawan Todia P., Apriani Lika, Verrall Ayesha J., Utami Fitria, Schneider Marion, Indrati Agnes R., Halim Pauline P., Kaplonek Paulina, Malca Hadar, Lee Jessica Shih-Lu, Moorlag Simone J. C. F. M., de Bree L. Charlotte J., Mourits Vera P., Joosten Leo A. B., Netea Mihai G., Alisjahbana Bachti, McNamara Ryan P., Alter Galit, van Laarhoven Arjan, Ussher James E., Sharples Katrina, Koeken Valerie A. C. M., Hill Philip C., van Crevel Reinout
Primary Institution: Radboud University Medical Center, Nijmegen, the Netherlands
Hypothesis
Can innate immune responses explain why some individuals do not develop tuberculosis despite heavy exposure?
Conclusion
The study suggests that a more efficient innate immune response, rather than antibodies, mediates early clearance of Mycobacterium tuberculosis.
Supporting Evidence
- Individuals with a BCG scar had a 50% lower risk of IGRA conversion compared to unvaccinated individuals.
- Persistently IGRA-negative individuals showed higher heterologous cytokine production.
- BCG vaccination induced heterologous innate cytokine production.
- IGRA conversion was associated with higher exposure to the index patient.
- Contacts with a BCG scar showed more pronounced differences in immune responses.
Takeaway
Some people can fight off tuberculosis without getting sick, especially if they have had a vaccine called BCG.
Methodology
The study examined immune responses in heavily exposed tuberculosis household contacts in Indonesia, focusing on innate immune cell dynamics and cytokine production.
Limitations
The study's definition of Mtb infection was based on IGRA, which cannot distinguish between mere immunoreactivity and actual infection.
Participant Demographics
Participants were tuberculosis household contacts in Indonesia, with a median age of 31 years for IGRA-positive and 22 years for IGRA-negative individuals.
Statistical Information
P-Value
<0.001
Confidence Interval
95% CI, 0.40–0.77
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website