The greenish tinge is the result of taking medications over a long period of time.
Almost all shoes in some research samples were coated with faecal bacteria which may cause severe diarrhoea, urinary tract infections and even meningitis.
Scientists have developed a pill to prevent Delhi belly -- a condition that causes cramps, vomiting and diarrhoea due to intake of contaminated food and water -- in those travelling to India and other tropical countries.