The study will be conducted at ten district health care facilities in Hanoi, Viet Nam. Investigators intend to enroll 2,000 participants aged 6-65 years with non-severe acute respiratory infection. Patients will be randomly allocated to the control or the intervention arm. Participants in the control group will be treated according to routine care. Participants in the intervention arm will have a CRP test, the results of which will be available to the health care practitioner to contribute to their diagnosis and treatment decisions.