11.   Symptoms include fever, aching muscles, and feeling generally unwell.

12.   Symptoms include fever, chills, and increased heart rate.

13.   Symptoms included nausea, vomiting, and watery diarrhoea.

14.   The symptoms include a craving for sweet foods.

15.   The symptoms included memory lapses, depression, insomnia, daytime fatigue, slurred speech, confusion and migraine like headaches.

16.   Typical symptoms of acid rain include deformed and dying trees, and trees with vastly reduced numbers of leaves.

17.   Symptoms include a sore throat and dry cough.

18.   Symptoms included frequent dryness in the mouth.

19.   Early symptoms include anorexia, muscular weakness and fatigue.

20.   Symptoms include red, itchy and inflamed skin.