These restrictions remind of ITAR. Building a rocket for a hobby? Never talk to foreigners about it, lest they make nuclear rockets. If that doesn't faze you, remember that USA almost stopped ecommerce because of ITAR banning export of cryptography that was once declare a munition. Because they didn't want foreigners to have access to encryption research.

What will happen is that honest people will follow the government and suffer from lack of potential discoveries while foreigners have their own avian flu virus studies, including 'mutations' that the US Government can be unprepared for.