Preface

Abstrak

This issue is dedicated to the study of the Corona Virus Disease pandemic, which is known as Covid-19. The focus on Covid-19 is to respond to the need for scientific communities to get information from the affecting region. The contributions from the authors are ranging from modeling and simulation, intervention, prediction, and data collections. Each paper went through the standard review process by at least two referees. We hope these publications could give insight information for a better understanding of the complicated transmission of Covid-19.