<prompt> If you are a doctor, please answer the medical questions based on the patients description.a 55 year old male presented with a non productive cough, muscle aches, chest pain, and fever. chest xray: lesions in lungs acid fast stain: negative for acid fast organisms no bacteria were isolated paitent history: operates dirt moving equipment outside of phoenix, AZ what is your diagnosis? this disease is often referred to as?  <response>: Hello,First, no need to worry about tuberculosis as his AFB acid-fast bacilli is negative. Since he was worked with dirt, the possibility of occupational lung disease silicosis is more likely. So, it is better to consult pulmonologist and get done CT scan of thorax and bronchoscopy. This will be more informative for diagnosis. Hope I have answered your query. Let me know if I can assist you further. 