Natural defense by saliva and mucosa against oral infection by Leptospira

Canadian Journal of Microbiology
Tatsuma AsohShin-ichi Yoshida

Abstract

Leptospirosis caused by drinking water has not been as frequently reported as percutaneous infection. Resistance to oral infection by pathogenic Leptospira was examined in an experimental hamster infection model. The results suggested some natural defenses against oral infection by Leptospira. First, we found that characteristic linear agglutination of Leptospira rapidly occurs when mixed with human saliva. That human saliva attenuated the infectivity of the treated leptospires by its agglutination activity suggested saliva to be the first line of defense against oral infection by leptospires. Second, only 10(1) Leptospira organisms caused death after submucosal injection into oral mucosa in hamsters, but oral infection with drinking water containing 10(5) organisms/mL did not cause death. This result showed that the mucosa plays the role of a physical barrier. Third, hamsters intragastrically infected by leptospires, with doses lethal to hamsters in oral infection, showed no signs of illness, which suggested that gastric acid plays an important role in preventing oral infection. Based on these results, saliva, mucosa, and gastric acid make up a natural defense, which confers high resistance to hosts against oral infection by l...Continue Reading

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Citations

Apr 1, 2016·PLoS Neglected Tropical Diseases·Anne-Laure ZilberZoheira Djelouadji
Jun 27, 2018·The American Journal of Tropical Medicine and Hygiene·Carla FernandezMichael A Matthias
Mar 7, 2017·Nature Reviews. Microbiology·Mathieu Picardeau
Oct 29, 2014·Pathogens and Global Health·Sarah Jane WynwoodScott Benjamin Craig
Dec 3, 2014·Nihon saikingaku zasshi. Japanese journal of bacteriology·Mitsumasa SaitoShin-ichi Yoshida
Aug 26, 2017·Journal of Oral Microbiology·Amal DafarFei Sjöberg

Related Concepts

Sodium metaperiodate
Agglutination
Gastric Acid
Exoglycosidases
Cricetus
Hydrogen-Ion Concentration
Leptospira interrogans
Leptospirosis
Mesocricetus
Phytomitogens

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