https://www.selleckchem.com/products/SNS-032.html A 79-year-old man was admitted to our ward with symptomatic heart failure 2 months after aortic valve replacement due to severe aortic stenosis. On the third day following admission, he became febrile (>38°C) while manifesting an increase in inflammatory markers. Endocarditis was suspected despite negative blood cultures. Echocardiogram (transthoracic and transesophageal) did not describe any vegetations. No hypermetabolic lesions were described on the Positron emission tomography scan. Empirical antibiotics were started but the fever persisted. Serologies revealed a Coxiella burnetii IgG phase II titre of 1800, high erythrocyte sedimentation rate. Positive antinuclear antibodies, antibeta2 IgM and anticardiolipin supported a diagnosis of acute Q fever endocarditis. Doxycycline and hydroxychloroquine were started with total resolution of symptoms. This case illustrates the difficulty of diagnosing Q fever endocarditis during its acute phase, not only because vegetations can be minimal or absent, a challenge that is further compounded by a complex presentation of immunological markers.Autoimmune hepatitis (AIH) is a rare chronic liver disease with a non-specific clinical presentation. Its physiopathology is not fully understood and, if untreated, can progress to cirrhosis and even fulminant liver failure. Here, we describe a case of a 73-year-old patient with an 11-month history suggestive of liver disease, who was concomitantly diagnosed with AIH and the extremely rare postinfantile giant cell hepatitis (PIGCH). Despite standard immunosuppressive therapy, the patient presented a severe clinical course, culminating in acute-on-chronic liver failure and death. This case reminds physicians of the importance of an early diagnosis, close monitoring and timely treatment of AIH. It also highlights the significant role in prognosis of the specific histological pattern of PIGCH, which has been mainly associated with a serious