Diarrhea-Inducing Parasite in Public Pools: How to Protect Yourself

People pee in swimming pools – that probably doesn’t come as a shock to you. You tuck it in the back of your mind when you go swimming; but you when you accidentally swallow a mouthful of pool water, you know you’re getting more than H2O and chlorine. Well, there’s another threat lurking in public swimming pools. It’s a diarrhea-inducing parasite called cryptosporidium, and federal officials said back in May that cases of the bug are on the rise.

Source: CDC

Outbreaks of cryptosporidium (Crypto) doubled between 2014 and 2016, including three that occurred last year, according to the CDC. There were at least 32 outbreaks in 2016, compared to 16 outbreaks in 2014, and 13 the year before. [1]

In a statement, the agency said:

“The parasite can spread when people swallow something that has come into contact with the feces (poop) of a sick person, such as pool water contaminated with diarrhea.” [1]

Suddenly Netflix and A/C sound very inviting.

The CDC added:

“Crypto is the most common cause of diarrheal illness and outbreaks linked to swimming pools or water playgrounds because it is not easily killed by chlorine and can survive up to 10 days in properly treated water.

Swallowing just a mouthful of water contaminated with Crypto can make otherwise healthy people sick for up to three weeks with watery diarrhea, stomach cramps, nausea, or vomiting, and can lead to dehydration.” [1]

Read: Watch Out: Thousands of Pools Close Due to Health Violations

Don’t rely on chlorine to clean up the poop: Even proper chlorination doesn’t kill Crypto. [2]

The most heavily-affected state was Ohio, with 1,940 people being sickened by the parasite in 2016, compared to less than 600 in any previous year.

It’s not clear why Crypto cases are on the rise. The CDC said:

“It is not clear whether the number of outbreaks has increased or whether better surveillance and laboratory methods are leading to better outbreak detection.”[2]

The agency wrote that the youngest swimmers are the most likely to infect pools with Crypto.

“Young swimmers aged under 5 years are more likely to contaminate the water because they are more likely to have inadequate toileting and hygiene skills; therefore, prevention efforts should focus on their parents.” [1]

Source: Nature

Regardless of age, many people continue swimming even when they’re symptomatic.

Once a pool has been infected, Crypto spreads easily and is stubborn against efforts to eradicate it. In chlorinated water, Crypto can survive for up to 10 days, and it only takes a small gulp of water to become infected. The only way to rid a swimming pool of the parasite is to close the pool and treat it with extremely high, extremely toxic levels of chlorine. [2], [3]

Michele Hlavsa, R.N., M.P.H., chief of CDC’s Healthy Swimming Program, said in a statement:

“To help protect your family and friends from Crypto and other diarrhea-causing germs, do not swim or let your kids swim if sick with diarrhea. Protect yourself from getting sick by not swallowing the water in which you swim.” [3]

(Hopefully, if you’re an adult, this goes without saying.)

The CDC also offered these tips for staying Crypto-free this summer:

  • If diarrhea is found to be caused by Crypto, wait 2 weeks after symptoms have subsided before going swimming.
  • Rinse off in the shower before getting in the water to help remove any germs on your body that could contaminate the pool.
  • Take children on frequent bathroom breaks, and check diapers in a diaper-changing area, not right next to the pool.


[1] NBC News

[2] The Washington Post

[3] CBS News



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How and Why You Should Prevent a Kissing Bug Infestation

Chagas disease, or “kissing bug disease,” could have a higher mortality rate than previously thought. Why? Because it often goes unreported, and more than half of the U.S. is reporting new cases. [1] [2]

Source: Good Housekeeping

Chagas is largely asymptomatic, so most people don’t know they have it. Chagas, which is transmitted by the so-called “kissing bug,” can cause heart and intestinal problems, but too often the damage isn’t realized until it’s too late, or doctors don’t associate symptoms with the disease. [1]

Dr. Ester Cerdeira Sabino, a co-leader in the study, explained:

“Most people who get infected, carry on with their lives … unaware they were bitten. A lot of mortality data doesn’t account for Chagas, so you underestimate the effect of the disease. What the parasite does to the body takes a long time; [it] slowly goes into the heart and destroys it.”

Read: Rare Diseases Chagas and Leprosy Becoming Commonplace in U.S.

Chagas disease is 1 of 5 parasitic infections the U.S. Centers for Disease Control is currently targeting for public health action. [2]

Kissing Bugs and Their Deadly Parasites

The scientific name for kissing bugs is Triatomine bugs, but they’re also sometimes called assassin bugs and vampire bugs. The blood-sucking insects usually bite humans when they’re asleep, either on the eyes or the lips. People can also accidentally scratch or rub the bugs’ feces into their eyes or mouth, or accidentally consume contaminated food. [1] [2]

After feeding on a person, parasites in the kissing bug’s feces can enter the body through breaks in the skin. [2]

When people do show symptoms, it is during the acute phase, the first few weeks after infection. An infected person might experience mild symptoms, such as fever, aches, and fatigue. The most noticeable sign of infection is called Romaña’s sign – when the eyelids near the point of infection start to swell.

During the chronic phase, cardiac or intestinal complications can develop.

Controlling the Kissing Bug Population

There are antiparasitic drugs on the market that can treat Chagas, but considering how rarely the disease goes detected, the best offense is a good defense. The most effective way to do this is by controlling the kissing bug population.

Kissing bugs like to hang out under porches, in dog houses, and under piles of rocks and wood. To prevent infestation, seal cracks and gaps, remove wood or rock piles near your home, and don’t let pets sleep outdoors. Roach hotels and other bait-like traps don’t work against kissing bugs.

Your chances of being bitten by a Triatomine bug are relatively low, but if you suspect you have been bitten, don’t ignore it – talk to your doctor immediately. [3]

In a May, 2017 study published in the journal PLOS Neglected Tropical Diseases, infection with Chagas was found to increase risk of death by 2 to 3 times from all causes.

Dr. Ligia Capuani, an infectious disease researcher at Faculdade de Medicina da Universidade de Sao Paulo, in Brazil, who led the research, said:

“In every age category, people who had Chagas died more than people who didn’t have Chagas. So if you’re infected early in life, you should be treated.” [1]


[1] Pulse Headlines

[2] Good Housekeeping

[3] CNN

Pulse Headlines


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