TABLE 1 .

Environmental strains used in this study

Isolate	Strain	Origin	Source	Doubling time (h) at 37°C
1	NIH120	Pigeon nest	Chester Emmons, What Cheer, IA	2.7
2	NIH192	Soil	Dexter Howard, Hot Springs, CA	2.9
3	NIH117	Pigeon nest	Chester Emmons, Loudon County, VA	2.8
4	NIH118	Pigeon guano	Chester Emmons, Washington, DCa	3.0
5	NIH115	Soil	Chester Emmons, Loudon County, VA	2.5
6	NIH119	Pigeon nest	Chester Emmons, Washington, DCb	2.9
7	NIH193	Pigeon cote	Dexter Howard, Westminster, CA	2.6
8	NIH316	Chicken house	Libero Ajello, CDC	3.0
9	NIH404	Soil	Harold Muchmore, Oklahoma	2.8

^aJunior Village.

^bCapitol dome.