I would recommend removing ill snakes from the room. Respiratory infections can be cause by a variety of bacteria, some are more vagile than others. It sounds like you might have a particularly resilient and movable strain of something. Speaking of which, have you had your vet culture this bacteria (if it is a bacteria)? This would almost definitely help you identify the best medicines to use, level of disinfecting needed, quarantine length, etc.

Anyways, quarantining the sick animals from the healthy animals for at least a month after they finish their medication should help cut down on your reinfections. In cases like this you really can't do too much disinfecting or quarantine.
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Lincoln, NE
0.1 Pastel, 1.0 Pastel het Pied, 0.1 Pied, 0.1 Cinn, 1.0 Black Pewter, 1.0 Woma (hidden gene?), 0.1 Yellowbelly
2.1 Normals, 1.0 Thayeri, 0.1 Thayeri X Alterna, 0.1 Whitesided P. catenifer sayi, 0.1 crazy cat, 1.0 husband

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• Help with RI !!! - rcrooks, Sat Jan 1 21:13:25 2011
• RE: Help with RI !!! - FGS, Sat Jan 1 22:28:42 2011
• RE: Help with RI !!! - Bolitochrome, Sat Jan 1 22:33:57 2011
• RE: Help with RI !!! - s_flconstrictors, Sun Jan 2 10:43:38 2011
• RE: Help with RI !!! - rcrooks, Mon Jan 3 10:36:35 2011
• RE: Help with RI !!! - rcrooks, Mon Jan 3 10:39:42 2011
• RE: Help with RI !!! - Bolitochrome, Mon Jan 3 11:22:43 2011
• RE: Help with RI !!! - rcrooks, Mon Jan 3 17:17:01 2011
• RE: Help with RI !!! - Bolitochrome, Mon Jan 3 18:52:02 2011