Comparing Tuberculosis Caused by Beijing and Non-Beijing Strains
Author Information
Author(s): Sun Yong-Jiang, Lim TK, Ong Adrian Kheng Yeow, Ho Benjamin Choon Heng, Seah Geok Teng, Paton Nicholas I
Primary Institution: Tan Tock Seng Hospital, National University of Singapore
Hypothesis
Beijing strains elicit a weaker Th1 immune response, as shown by a reduced production of plasma IFN-γ.
Conclusion
Patients with tuberculosis caused by Beijing strains appear to be less symptomatic than those who have disease caused by other strains.
Supporting Evidence
- Patients infected with Beijing strains had a significantly lower frequency of fever (42.9%) compared to non-Beijing strains (85.0%).
- Night sweats were less frequent in patients infected with Beijing strains (9.5%) compared to non-Beijing strains (35.0%).
- Patients with Beijing strains had a longer median duration of cough before diagnosis (60 days) compared to non-Beijing strains (30 days).
- Patients infected with non-Beijing strains had significantly higher IL-4 gene expression.
Takeaway
This study found that people with tuberculosis from Beijing strains have fewer symptoms like fever and night sweats compared to those with other strains.
Methodology
Patients with pulmonary tuberculosis were grouped by their M. tuberculosis genotypes, and clinical features, plasma cytokine levels, and cytokine gene expression levels were compared.
Potential Biases
Some clinical data were based on patients' subjective descriptions, which may not be very accurate.
Limitations
The small sample size may mean that important differences between groups were not detected.
Participant Demographics
The study included 41 patients with a mix of ethnicities and ages, with 51.2% infected with Beijing strains.
Statistical Information
P-Value
p = 0.008 for fever, p = 0.049 for night sweats, p = 0.048 for cough duration.
Confidence Interval
95% CI reported for various odds ratios.
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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