In the sentence extracted from biomedical literature, identify all the disease entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="disease"> to denote a disease.

### Input Text: G6PD activity was detected in samples obtained from biopsies on the quadriceps muscle of seven males and one female .
### Output Text:
G6PD activity was detected in samples obtained from biopsies on the quadriceps muscle of seven males and one female . 