(CBS News)

Outbreaks of illness in pools, hot tubs and lakes throughout the United States have been increasing in recent years as a result of a parasite called Cryptosporidium.

The Centers for Disease Control and Prevention (CDC) issued a report today that  documented 90 illness outbreaks reported in 32 states and Puerto Rico for the years
2011-2012. Illnesses affected at least 1,788 people and resulted in at least 95 
hospitalizations and one death.

The majority of outbreaks were associated with treated recreational water such as
swimming pools and hot tubs and involved Cryptosporidium. The parasite can survive
for 10 days or more even in water that's chlorinated to kill germs.

"This parasite is extremely chlorine-resistant," Michele Hlavsa, lead author of 
the report, told CBS News. "Swimmers bring it into the water when they are sick 
with diarrhea."

CDC's report states, "Since 1988, the year that the first U.S. treated recreational
water-associated outbreak of Cryptosporidium was detected, the number of these outbreaks
reported annually has significantly increased."

In the U.S., codes regulating public recreational pools and spas are established
 by state or local agencies. CDC suggests that these variations in codes could be
leading to outbreaks.