PURWONO, PRIYO BUDI, Institute of Tropical Disease, Universitas Airlangga, Jalan Mulyoreijo, Surabaya 60115, Indonesia Department of Microbiology, Faculty of Medicine, Universitas Airlangga, Jalan Mayjen Prof Dr Moestopo 47, Surabaya 60131, Indonesia Indonesia-Japan Collaborative Research Center for Emerging and Re-emerging Infectious Diseases, Universitas Airlangga, Jalan Mulyoreijo, Surabaya 60115, Indonesia