[1] UNIV KENTUCKY, DEPT MED MICROBIOL & IMMUNOL, LEXINGTON, KY 40536 USA
[2] UNIV KENTUCKY, DEPT BEHAV SCI, LEXINGTON, KY 40536 USA
[3] UNIV KENTUCKY, DEPT PATHOL, LEXINGTON, KY 40536 USA
[4] VET ADM MED CTR, LEXINGTON, KY 40511 USA
[5] UNIV KENTUCKY, SANDERS BROWN RES CTR AGING, LEXINGTON, KY 40536 USA