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Re: Again I ask the Perth Group to provide us with references for their "Rules of Retroviral Isolation".

The Perth Group have asserted that:

1. There exists a set of "Rules for Retroviral Isolation"
2. These are the traditional rules which have been used for over 50 years for isolating retroviruses
3. HIV has not been isolated according to these rules
4. Therefore HIV does not exist

I have simply requested that the Perth Group provide a reference that clearly states the rules as they have written them.

If, as the Perth Group claims, they have not invented them themselves it should be easy to do so. The fact that they have not done so and instead have tried to avoid the question forces me to conclude that these rules exist only in the imagination of the Perth Group.

If these rules have in fact been used for over 50 years then it should be easy to provide one example where a retrovirus was proven to exist using these rules.

Competing interests: None declared