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From the Wikipedia article about Louis, Dauphin of France, the son of Louis XV:

"He was bitterly disappointed when his father would not permit him to join the 1744 campaign in the War of the Austrian Succession. When his father became deathly ill with fever at Metz, Louis disobeyed orders and went to his bedside. This rash action, which could have resulted in the deaths of both Louis and his father, resulted in a permanent change in the relations between father and son."

This episode happened between August 4th and August 15th 1744. Apparently Louis XV suffered from fevers and disentery. So, WI the disease was more serious, and took not only the king but his son? How would it affect the Austrian Succession War? And how would the French succession be affected? Would one the Spanish Bourbons get France (but surely having to renounce Spain in order to ensure it) or would the Duke of Orleans claim the throne?
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