2553
As this relapse coincided with development of a strong delayed-type hypersensitivity response to tuberculin and improved after treatment with the anti-inflammatory agent oxpentifylline, it was probably caused by restoration of pathogen-specific cellular immunity.
 adverse event: development 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: development 