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 treatment is transient and cannot be effectively re - administered due to the presence of neutralizing antibodies directed against the recombinant adenoviral vector .
### Output Text:
This treatment is transient and cannot be effectively re - administered due to the presence of neutralizing antibodies directed against the recombinant adenoviral vector . 