Ex-training participants in JICA training are now confronting the COVID-19 pandemic in their respective countries. The knowledge and experience gained from the training in Japan have inevitably evolved into on-site actions in a variety of ways, including the implementation of accurate PCR testing, leading the way in effective hospital case management and supportive care to patients with COVID-19 infections. Furthermore, the ex-participants’ network in developing countries is enabling them to share their knowledge and experiences across borders via online.