Occurrence of K1 and K2 serotypes and genotypic characteristics of extended spectrum β-lactamases-producing Klebsiella pneumoniae isolated from selected hospitals in Malaysia oleh Nurul Syazrah Anuar, Hazmin Hazman, Sharven Raj Jeyakumar, Mohd Nasir Mohd Desa, Hasni Idayu Saidi, Siti Norbaya Masri, Nur Afiza Aziz, Nurshahira Sulaiman