The C-reactive Protein (CRP) Point of Care Testing (POCT) Implementation to Adult Patients Presenting With Symptoms of the Acute Respiratory Tract Infection (ARTI) in Eight Primary Health Care (PHC) in Jakarta.

Inclusion Criteria: 1. Adults aged ≥18 years. 2. Presenting to the PHC site for the first consultation of the current episode of Acute-Respiratory Tract Infections (ARTI). 3. Reporting at least one of the following symptoms or clinical signs within the past 5 days: cough, rhinitis (e.g., sneezing, nasal congestion, or runny nose), pharyngitis (e.g., sore throat), shortness of breath, wheezing, chest pain, abnormal lung sounds on auscultation. Exclusion Criteria: 1. Presenting with severe illness requiring referral to a higher-level healthcare facility (e.g., hospital). 2. Having known immunosuppression or chronic conditions, including but not limited to: HIV infection; chronic liver disease; history of malignancy; long-term use of systemic corticosteroids or other immunosuppressive therapies, as assessed by the healthcare worker or study team. 3. Having taken antibiotics prior to the visit to the primary health center.