KTR - Korea Test & Research Institute KTR www.ktr.or.kr USA branch contact point The antiviral test result of CAZ fibers conducted by the Korea Test & Research Institute (KTR), the only national virus testing institute in Korea, shows that the pathogenic Human Influenza A (H1N1) virus was 99.9% inactivated within 5 minutes (minimum test time) (2020.3.30) KOTITI - Nationally Authorized Testing- I..