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: Individuals without apparent symptoms or signs of HD were found at 36 repeats ( aged 74 , 78 , 79 , and 87 years ) , 37 repeats ( aged 69 years ) , 38 repeats ( aged 69 and 90 years ) , and 39 repeats ( aged 67 , 90 , and 95 years ) .
### Output Text:
Individuals without apparent symptoms or signs of <span class="disease">HD</span> were found at 36 repeats ( aged 74 , 78 , 79 , and 87 years ) , 37 repeats ( aged 69 years ) , 38 repeats ( aged 69 and 90 years ) , and 39 repeats ( aged 67 , 90 , and 95 years ) . 