Electron microscopy of many spirochetes

International Leptospirosis Society

The International Leptospirosis Society Inc. (ILS) was formed in 1994 to promote knowledge on leptospirosis through the organization of regional and global leptospirosis meetings.


  • To create awareness about leptospirosis among medical and veterinary professionals, scientists, health planners, policymakers, and the general public in different parts of the world
  • To organize an international scientific meeting of the Society, biennially or as appropriate
  • To facilitate communication among people with an interest in leptospirosis
  • To provide up-to-date epidemiological information on leptospirosis to international and national health authorities as requested
  • To provide or support internationally available services, as appropriate, that will assist the diagnosis of leptospirosis, research into leptospirosis, or the control or treatment of leptospirosis


Membership in the Society is open to everybody interested in leptospirosis.

  • There are no costs involved with membership in the Society.
  • The ILS Google Group is the principal means of communication between ILS members.
  • Join the ILS Google Group. You will be taken to a page that displays a “Join group” button (see adjacent image). You must be signed into your Google account to see the button. Click or tap the button to join the group.
Screenshot of webpage for joining ILS Google Group with the "Join group" button circled

Our Next Meeting

The deadline to submit an abstract has been extended to 22 April 2024.

MAT Proficiency Testing

Any laboratory performing the microscopic agglutination test (MAT) can learn about the quality of their MAT testing and improve their performance of the MAT by participating in the International Leptospirosis MAT Proficiency Testing Scheme.

A single spinning spirochete
Movie of a L. biflexa strain Patoc I cell swimming in a 0.5% methylcellulose solution. The motion was recorded using a high-speed camera (500 fps). The movie is shown at ten-times reduced speed. Provided by Shuichi Nakamura of Tohoku University, Japan.

Let us know what you think about the ILS website. We need your feedback! Please send comments and suggestions to: leptosociety@gmail.com