Volume 15, Number 8—August 2009
Letter
Tick-Borne Rickettsiosis in Traveler Returning from Honduras
Lin H. Chen
and Mary E. Wilson
and Mary E. WilsonTable
Rickettsia spp. serologic titers for a man who returned from Honduras, 2005*
| Test | Titers on specific date |
||||
|---|---|---|---|---|---|
| May 26 | Jun 10 | Jul 14 | Aug 25 | Nov 22 | |
| RMSF IgG† | Positive, >1,024 | Positive, >1,024 | Positive, >1,024 | Positive, >1,024 | |
| RMSF IgM† | Positive, 512 | Positive, 256 | Positive, 128 | Positive, 256 | |
| R. conorii IgG† | >1,024 | 512 | 512 | ||
| R. conorii IgM† | 64 | 64 | 64 | ||
| R. africae IgG‡ | 2,048 | 4,096 | |||
| R. africae IgM‡ | 512 | ||||
| R. conorii IgG‡ | 2,048 | 4,096 | |||
| R. conorii IgM‡ | 512 | ||||
| R. rickettsii IgG‡ | 1,024 | ||||
| R. rickettsii IgM‡ | 256 | ||||
*Reference titer for negative/normal result is <64. RMSF, Rocky Mountain spotted fever; Ig, immunoglobulin.
†Testing done by Focus Diagnostics, Cypress, CA, USA.
‡Testing done by Centers for Disease Control and Prevention, Atlanta, GA, USA.
