Several members have asked this question over the years and recently I was sorely tempted on seeing a sparkling blue public swimming pool with very few enjoying it. It has also been quite hot here recently, further adding to the temptation of having a cooling swim. However, having just read this article by Simon Reid, Associate Professor or Communicable Disease Control, The University of Queensland and Una Ryan, Professor in Biochemistry, Murdoch University, I think I'll continue to forgo that particular pleasure until my immune system is less compromised:
If you are in the early stages of CLL and/or your immune system is still fairly good, then perhaps you'll be able to enjoy a refreshing swim. While the above article is not written for immune compromised people in mind, it does include many helpful hints that if followed, should make your dip less dangerous to your health.