Hmmm, at the hospital I work at it's standard practice to warn of possible (even if slim) chances of contagious things. Many of these type things are already present in the environment all the time anyways (staph, pseudomonus etc) however it can enter through a break in the skin and cause problems, in people with weakened immune systems (and typically elderly) and in young children (putting hands around eyes/nose/mouth without handwashing).
http://www.cdc.gov/healthypets/extra_risk.htm
Pseudomonus can commonly be found in contaminated water, even in public pools, but may also be found in ground water, ponds, ditches etc.
http://www.cdc.gov/mmwr/preview/mmwrhtml/00000126.htm
http://www.cdc.gov/healthyswimming/derm.htm
http://www.cdc.gov/healthyswimming/swimmers_ear.htm
As long as you keep your hands washed and out of your mouth, eyes, nose when doing Yodie's ears, and don't have open cuts you should be fine if you're a healthy adult.
I've worked around this stuff for 8 years now and have never gotten it myself so it's not something you should lose sleep over.![]()
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