Ayako Sumi, Masayuki Koyama, Manato Katagiri, Norio Ohtomo. Spectral study of COVID-19 pandemic in Japan: the dependence of spectral gradient on the population size of the community. PLoS ONE. 2025. 20. 1. e0314233
Ayako Sumi. Time series analysis of daily reported number of new positive cases of COVID-19 in Japan from January 2020 to February 2023. PLoS ONE. 2023
Keiji Mise, Ayako Sumi, Shintaro Takatsuka, Shin-ichi Toyoda. Associations between Meteorological Factors and Reported Mumps Cases from 1999 to 2020 in Japan. Epidemiologia. 2021. 2. 2. 162-178
Mitsuyo Kawaguchiya, Noriko Urushibara, Meiji Soe Aung, Kenji Kudo, Masahiko Ito, Ayako Sumi, Nobumichi Kobayashi. Clonal lineages and antimicrobial resistance of nonencapsulated Streptococcus pneumoniae in the post-pneumococcal conjugate vaccine era in Japan. International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases. 2021. 105. 695-701
Gaowa Bai, Toshiro Niki, Haruhisa Kikuchi, Ayako Sumi, Nobuyuki Kobayashi, Takahiro Haruyama, Jing Zhang, Haorile Chagan-Yasutan, Toshio Hattori. New Development of Disaster-Related and Tropical Infectious Diseases Control. Reports - Medical Cases, Images, and Videos. 2020. 3. 1. 5-5
Ayako Sumi, Nobumichi Kobayashi. Collaborative Research with Chinese, Indian, Filipino and North European Research Organizations on Infectious Disease Epidemics. Nihon eiseigaku zasshi. Japanese journal of hygiene. 2017. 72. 2. 112-122