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Correction published on 25 October 2018, see Trop. Med. Infect. Dis. 2018, 3(4), 113.

Open AccessArticle

Serological Cross-Reactivity among Orientia tsutsugamushi Serotypes but Not with Rickettsia japonica in Japan

1
Department of General Internal Medicine, Kameda Medical Center, Chiba 296-8602, Japan
2
Department of Clinical Tropical Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8523, Japan
3
Department of Clinical Medicine, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki 852-8521, Japan
4
Mahara Institute of Medical Acarology, Tokushima 779-1510, Japan
*
Author to whom correspondence should be addressed.
Trop. Med. Infect. Dis. 2018, 3(3), 74; https://doi.org/10.3390/tropicalmed3030074
Received: 21 May 2018 / Revised: 30 June 2018 / Accepted: 3 July 2018 / Published: 5 July 2018
(This article belongs to the Special Issue The Past and Present Threat of Rickettsial Diseases)
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Abstract

The rickettsial diseases Japanese spotted fever (JSF) and scrub typhus (ST) are caused by Rickettsia japonica and Orientia tsutsugamushi, respectively. The diseases share clinical symptoms, such as fever, rash, and eschar. However, there are no systematical investigations of the serological cross-reactivity between R. japonica and O. tsutsugamushi. Also, the serological cross-reactivity among O. tsutsugamushi serotypes is still unclear. We analyzed 1406 cases tested by indirect immunoperoxidase assay using seven rickettsial antigens—one R. japonica and six O. tsutsugamushi serotypes—between 2003 and 2016 at two reference centers in Japan. Of these, 167 JSF and 190 ST cases were serologically diagnosed. None of the ST cases had a significant increase in IgM titers against R. japonica. Six JSF cases showed IgG titers of ≥40 against O. tsutsugamushi, but no IgG titer showed a significant elevation in the convalescent phase sample. We observed a substantial degree of cross-reactivity between O. tsutsugamushi serotypes. Cross-reactivity was significant among Karp, Hirano/Kuroki, and Kato types and between Gilliam and Irie/Kawasaki types in IgM, while the Shimokoshi type was less cross-reactive than the others. In conclusion, there is no serological cross-reaction between R. japonica and O. tsutsugamushi. The cross-reactivity among O.tsutsugamushi varies depending on serotypes. View Full-Text
Keywords: Orientia tsutsugamushi; Rickettsia japonica; scrub typhus; Japanese spotted fever; tsutsugamushi disease Orientia tsutsugamushi; Rickettsia japonica; scrub typhus; Japanese spotted fever; tsutsugamushi disease
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Sando, E.; Ariyoshi, K.; Fujita, H. Serological Cross-Reactivity among Orientia tsutsugamushi Serotypes but Not with Rickettsia japonica in Japan. Trop. Med. Infect. Dis. 2018, 3, 74.

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