The investigators want to compare blood microbiota profile between patients with documented coronary lesions and patients free of coronary disease.

Inclusion Criteria:

• Cases : patients who have had a myocardial infarction within one month to one year before the inclusion
• Controls : patients without history of myocardial infarction, free of coronary disease in the view of one of the following tests performed within one year before the inclusion :

Effort test Echocardiographic stress test Myocardial perfusion scintigraphy Coronarography with >= 2 major cardiovascular risk factors:

1. Treated hypertension,
2. Treated dyslipidemia
3. Current smoking
4. Diabetes mellitus

Exclusion Criteria:

• Infectious disease within one week before the inclusion
• Immunocompromised patients
• Antibiotic treatment within one month before the inclusion
• Chronic viral infection
• Chronic inflammatory intestinal bowel disease
• Renal failure (estimated glomerular filtration rate< 50 ml/min//1.73 m2)
• Pregnancy

case : patients who have had a myocardial infarction within one month to one year before the inclusion controls : patients without history of myocardial infarction, free of coronary disease in the view of one of the following tests performed within one year before the inclusion Effort test Echocardiographic stress test Myocardial perfusion scintigraphy Coronarography with >= 2 major cardiovascular risk factors:

• Treated hypertension,
• Treated dyslipidemia
• Current smoking
• Diabetes mellitus