( vii ) if hiv were to cause aids , it would have a paradoxical , country-specific pathology , causing over 90 % pneumocystis pneumonia and kaposi sarcoma in the u.s. but over 90 % slim disease , fever , and diarrhea in africa . ( viii ) it is highly improbable that within the last few years two viruses ( hiv-1 and hiv-2 ) that are only 40 % sequence-related would have evolved that could both cause the newly defined syndrome aids .
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