The phrase "new subtype" refers to a new kind or type within a broader category. It means that a different version or variation of something has been identified or discovered. Full definition
«Researchers discover new subtype of cervical cancer.» (sciencedaily.com)
It is feared that if the avian influenza virus combines with a human influenza virus (in a bird or a human), the new subtype created could be both highly contagious and highly lethal in humans. (sciencedaily.com)
A team of University of South Carolina scientists led by Carolyn Banister and Phillip Buckhaults has identified a new subtype of cervical cancer that, like most cervical cancers, is triggered by human papillomavirus (HPV) but whose growth is not directed by the virus, suggesting that therapy targeting these tumors» distinct genomic pathways may improve patient outcomes over standard treatment. (sciencedaily.com)