21.   It found no known case of the HIV transmission in sports.

22.   It has been found in trace amounts in the tears of some AIDS patients, but there are no known cases of someone getting HIV from sweat or tears.

23.   It is the first known human case of West Nile in Georgia and the first recorded death of a human from the virus in the United States this year.

24.   It is the only known case of retaliation so far.

25.   One known case of a virus doing good, at least for Dutch tulip sellers, comes from the tulip mosaic virus.

26.   Perhaps the entire species has come down with the first known case of chronic evolutionary fatigue syndrome.

27.   Since the AIDS screening became routine at fertility clinics there has been only one known case of someone contracting HIV through donated sperm.

28.   So far, the townsfolk say, there has been no known case of the Taliban punishing any intruder.

29.   So Primi sought to test stored blood samples from known cases of a variety of conditions.

30.   So far, officials said, the Liberian is the only known case in the area.