Correlation between the concentrations of tumor necrosis factor-alpha and the severity of disease in patients infected with Orientia tsutsugamushi.
BACKGROUND
Patients with tsutsugamushi disease sometimes die if they do not receive appropriate chemotherapy. This study measured the concentration of several cytokines both before and after the administration of tetracyclines, and evaluated the changes in cytokine levels in patient serum to investigate the relationship between serum levels of cytokines and disease severity.


METHODS
A total of nine patients were infected with Orientia tsutsugamushi. The diagnosis of tsutsugamushi disease was made using an indirect immunoperoxidase antibody test. The serum concentrations of cytokines were measured using enzyme-linked immunosorbent assays.


RESULTS
The levels of interleukin (IL)-10 (mean 71.7 pg/ml) and IL-12p40 (mean 588 pg/ml) were elevated in all patients in the acute phase, above the normal upper limits. Tumor necrosis factor-alpha (TNF-alpha) levels (mean 9.20 pg/ml) were elevated in 89% and interferon-gamma (IFN-gamma) levels (mean 41.0 pg/ml) in 44% of patients. The down-regulation of these overproduced cytokines was observed after chemotherapy. There was a significant correlation between the concentrations of TNF-alpha in the acute phase and the severity of disease (r=0.918).


CONCLUSIONS
The concentration of TNF-alpha may predict the severity of tsutsugamushi disease in the acute infectious phase.
Iwasaki
Hiromichi
H
First Department of Internal Medicine, Faculty of Medical Science, University of Fukui, Matsuoka, Fukui, Japan. hiwasaki@u-fukui.ac.jp
Mizoguchi
Jiro
J
Takada
Nobuhiro
N
Tai
Katsunori
K
Ikegaya
Satoshi
S
Ueda
Takanori
T
D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000097:blood; D016753:Interleukin-10 / Q000097:blood; D053762:Interleukin-12 Subunit p40 / Q000097:blood; D015847:Interleukin-4 / Q000097:blood; D008297:Male; D008875:Middle Aged; D012285:Orientia tsutsugamushi / Q000254:growth & development*; D012612:Scrub Typhus / Q000188:drug therapy / Q000276:immunology* / Q000469:parasitology; D012720:Severity of Illness Index; D013752:Tetracycline / Q000008:administration & dosage*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood*
D000900:Anti-Bacterial Agents; D053762:Interleukin-12 Subunit p40; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D015847:Interleukin-4; D007371:Interferon-gamma; D013752:Tetracycline