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Updated: Jun 19, 2026

Polymerase Chain Reaction and Dot-Blot Hybridization for Leptospira Detection in Water Samples

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Published on: June 14, 2024

STUDIES OF LEPTOSPIRA HEBDOMADIS.

M Koshina¹, S Shiozawa, K Kitayama

¹Medical Clinic of Tokyo Imperial University, Tokyo, Japan.

The Journal of Experimental Medicine

|October 30, 2009

Summary

Akiyami disease is an infectious leptospira illness. Two types of leptospira were identified, one highly virulent and distinct, the other identical to Leptospira hebdomadis.

Area of Science:

Infectious Diseases
Bacteriology
Veterinary Medicine

Background:

Akiyami disease is prevalent in Shida district, Shizuoka province.
The etiological agent of Akiyami was previously unknown.

Purpose of the Study:

To determine the cause of Akiyami disease.
To characterize the leptospiral strains involved in Akiyami.

Main Methods:

Etiological study of Akiyami disease.
Isolation and characterization of leptospiral strains.
Virulence testing in guinea pigs.
Serological differentiation of isolates.

Main Results:

Akiyami is an infectious disease caused by leptospira.

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Two distinct types of leptospira were isolated from Akiyami cases.

Type A leptospira was highly virulent and serologically distinct.

Type B leptospira was less virulent and serologically identical to Leptospira hebdomadis.

Field mice (Microtus montebelli) were found to harbor Type A leptospira.

Conclusions:

Akiyami is caused by leptospira, with two identified types.
Type A represents a novel virulent strain, while Type B is identified as Leptospira hebdomadis.
Field mice are a potential reservoir for the virulent Type A strain.