Pericardial syndrome includes pericardites acute pericardial effusion and cardiac tamponade, recurrent pericarditis squeezing chronic pericarditis. The etiologies are very numerous and can be classified as infectious, neoplastic, metabolic or systemic, toxic causes. Diagnosis is difficult, and 80% of etiologies remain classified idiopathic. In their laboratory to improve the diagnosis of this syndrome investigators have developed a strategy of systematic prescription of biological tests by kit. This prescription by 'kit' strategy proved its interest by comparison with an intuitive requirement of biological. In this study investigators want to improve the diagnostic causative of pericarditis by implementing a new diagnostic strategy. This new strategy includes (i) samples additional less invasive for the patient, the swab pharyngeal and nasal, (ii) the addition of at the outset of more effective diagnostic techniques: specific Polymerase Chain Reaction (PCR)

Inclusion Criteria:

• Patient prescribed with a pericarditis kit for etiological diagnosis of a pericardial syndrome.
• Adult patient (= or > 18 years old)
• Patient who freely signed the informed consent form.
• Patient affiliated to a health insurance regime

Exclusion Criteria:

• Minor patient ( age <18 years)
• Pregnant, parturient or breastfeeding woman
• Adult patient incapable or unable to consent
• Patient deprived of liberty under judgment
• Person living in a health or social specialised structure
• Person in vital emergency situation