“…For example, the cause of Wolfgang Amadeus Mozart's death at the age of 35 years in 1791 remains obscure. Suggested causes include arsenic poisoning, 4 trichinosis, 4 a beta-haemolytic streptococcal infection, 5 bacterial endocarditis, 6 Henoch-Schönlein purpura, 4,7 rheumatic fever, 8 renal failure 9 and the obscure disease ‘hitziges Frieselfieber’ (military fever). 4,8,10 One of these diagnoses may be correct but the paucity of data and conflicting observations render the problem unsolvable for now.…”