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Pastimes : Clown-Free Zone... sorry, no clowns allowed

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To: Terry Maloney who wrote (313042)10/2/2005 7:34:02 PM
From: Elroy Jetson   of 436258
 
The Tamiflu and Relenza situation with Bird Flu is similar to the situation with HIV.

All drugs in a certain class target the same enzyme. But when a mutant virus emerges to escape the shape of one drug, they typically become less fit and less virulent (This is because wild-virus has emerged as the most fit). The mutant virus is also likely to be blocked by a drug with a different molecule which has a different shape.

The development process and thus the molecules of Relenza and Tamiflu are quite different. This minimizes the likelihood of cross-resistance.

Me-too drug development in HIV led to more drug cross-resistance than you might otherwise expect.
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