Symptoms include a sore tongue and cracked lips, as well as general fatigue and weakness.

Save for general fatigue, a few bumps and bruises and some nasty seat sores, all were in good health - and even better spirits.

Muscle weakness and general fatigue are a result of low blood sugar and dehydration.

Symptoms include a rash or itchy skin, fever and chills, coughing and muscle aches, and general fatigue, but these might not be felt for a month or two after infection.

Red deer, too, have for centuries been farmed for their antlers, which are used to treat impotence and general fatigue.