11.   It was not immediately clear how the cow contracted the suspected infection.

12.   The patients who became blind contracted the infection while undergoing relatively simple surgery to remove cataracts.

13.   The viral infection is contracted through sex, a blood transfusion or may be transmitted from an infected mother to her unborn child.

14.   In a statement, doctors added that since noon GMT Papandreou had suffered from fever, which was a sign he had contracted another infection.