<s>[INST] my husband has had a wound vac on since monday and his wound drainage is yellowish-brown and smells like rotten eggs. any idea what bacteria would be causing the infection? he is currently in the hospital now awaiting multiple tests, including CBC, wound culture and CT scan. [/INST] HiT hanks for choosing Chat Doctor for your query. I can understand the problem discussed in your question. Apparently your husband is having what is known as surgical site infection. In the hospital setting the most common organism is Staphylococcus aureus. It can be treated with antibiotics based upon the wound culture and sensitivity.Maybe he needs antibiotics like Vancomycin, or Minocycline which depends upon their sensitivity in the wound culture. Sometimes additional surgery or may be required to treat the wound infection. Make sure that friends and family members wash their hands before and after they enter your husbands' room as staphylococcus infection is highly contagious it spreads by touching, shaking hands, sharing the clothes, or utensils. I hope your query has been answered. Your feedback in this regard is highly appreciated. </s>