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: This founder effect provides a unique opportunity for population - based screening for A - T carriers in a large Jewish community . .
### Output Text:
This founder effect provides a unique opportunity for population - based screening for <span class="disease">A - T</span> carriers in a large Jewish community . . 