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DEPARTMENT OF HEALTH & HUMAN SERVICES

  Public Health Service

National Institutes of Health
Rocky Mountain Laboratories
Hamilton, Montana 59840
(406) 363-3211
FTS (700) 322-8400

January 13, 1995

Dear Sir:*

This is to inform you that we have received a sample (12 ml) of your colloidal silver (1,500 ppm) preparation and have evaluated its effectiveness in a preliminary pilot study against Lyme disease spirochete, Borrelia burgdorferi (B31) and against the relapsing fever agent, B. Hermsii (HS-1).*

In both tests, BSK cultured spirochetes were treated with 150 and 15 ppm of colloidal silver. When examined 24 hours later, none of the treated cultures contained live spirochetes. Few spirochetes, all dead, were observed at 48 hours.

Additional in vitro and in vivo studies are in progress and will be reported as soon as results become available.

Sincerely yours,

Willy Burgdorfer, Ph.D.
Scientist Emeritus
Rocky Mountain Laboratories

Microscopy Branch
Tom G. Schwan, Ph.D.

Senior Staff Fellow
Laboratory of Microbial Structure and Function

WB/TGS:bk