Respiratory infections, including episodes of coughing with fever, are the main cause of outpatient antibiotic prescription, while a minority of them are linked to bacterial infections requiring antibiotic. These prescriptions are often performed by general practitioners. These unnecessary antibiotic contribute to increased bacterial resistance, side effects and unnecessary costs. Campaigns for the correct prescription of antibiotics have had a real but partial or transient success.

C-reactive protein micro-method (POCT-CRP) could help to differentiate between viral and bacterial infections and thus contribute to the proper use of antibiotics. The decrease in prescription of antibiotics is likely to have an even stronger positive impact in countries like France, where prescription is high.

The objective of this study is to evaluate the use of POCT-CRP in the general practitioner's office in case of suspected respiratory infection.

Inclusion Criteria:

• Age ≥ 3 years
• Clinical suspicion of respiratory infection defined by the presence of at least one respiratory sign among, cough, dyspnea, chest pain and auscultatory abnormality and at least one general sign among fever, sweat, headache, myalgia, impairment of general condition
• Affiliated to a social health insurance
• Signed consent

Exclusion Criteria:

• Duration of symptoms < 24 hours
• Hospitalization or emergency assessment decision decided from the outset
• Signs of severity before the realization of POCT-CRP
• Patient previously included in the study for the same episode
• Antibiotic therapy within 7 days
• Chronic cough (more than 3 weeks)