On September 2nd, 2022, Asst. Clin. Prof. Paul Adamson from the Division of Infectious Diseases, David Geffen School of Medicine, University of California Los Angeles (UCLA), USA, visited the Division of Infectious Diseases, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, under the warm hospitality of Assoc. Prof. Pornpan Koomanachai and the faculty members of the Division of Infectious Diseases.