Drain tip culture had a high positivity rate in the SSI group and the coincidence rate for the causative pathogen was relatively high 1).

1)
Kawabata A, Sakai K, Sato H, Sasaki S, Torigoe I, Tomori M, Yuasa M, Matsukura Y, Arai Y. Methicillin-resistant Staphylococcus Aureus Nasal Swab and Suction Drain Tip Cultures in 4573 Spinal Surgeries: Efficacy in Management of Surgical Site Infections. Spine (Phila Pa 1976). 2017 Aug 1. doi: 10.1097/BRS.0000000000002360. [Epub ahead of print] PubMed PMID: 28767628.