Regarding pericarditis

• A. constrictive pericarditis only rarely follows suppurative pericarditis
• B. primary pericarditis is usually bacterial in origin
• C. serous pericarditis may be due to ureamia
• D. haemorrhagic pericarditis is most commonly due to Klebsiella infection
• E. fibrinous pericarditis is due to TB until proven otherwise