Through the proposed work we seek to better understand the epidemiology of the new canine-like coronavirus, CCoV-HuPn-2018, we recently discovered in a child with pneumonia in Sarawak, Malaysia.  Our interdisciplinary and international team will achieve this by developing molecular and serologic tools to detect the CCoV-HuPn-2018 or CCoV-HuPn-2018 infection. Next, we will use these tools and a cross-sectional study of 200 pneumonia patients and 50 controls to determine how common the virus is among pneumonia patients and the general population in in Sarawak, Malaysia. Finally, we will examine study questionnaire data from study participants to see if we can identify risk factors for CCoV-HuPn-2018 infection.