Cryptosporidium parvum produces -resistant cysts that cannot be chemically inactivated by a halogen used to decontaminate recreational water. The cysts are also too small to be removed by standard pool filters. Therefore, public pools and water parks can protect visitors against this pathogen by treating the water with UV radiation.
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.. -resistant cysts". The text explains that these cysts cannot be chemically inactivated by halogens and are too small to be removed by pool filters. This implies that the cysts are resistant to these common water treatment methods. Show more…
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9. UV water treatment systems are effective in treating protozoans, viruses, bacteria, all of these. 10. UV irradiation inactivates Cryptosporidium because it denatures the proteins within the microorganism, it blocks the action of lysozyme, it removes thymine dimers within the DNA, it blocks the action of DNA polymerase and RNA polymerase.
Sri K.
On January 21, a physician notified the New Mexico Department of Health (NMDH) of a dramatic increase in acute gastroenteritis among students at a small college in Las Vegas, New Mexico. Las Vegas is city located in northern New Mexico [population estimate: 13,285] and is the county seat of San Miguel County [population estimate: 27,760]. The physician reported examining hundreds of students with a gastrointestinal illness at the college’s student health center during the previous week. The majority of students reported having abdominal pain and watery diarrhea of several days duration. Typically, approximately 100 students were examined at the student health center each day, the majority of whom presented with upper-respiratory infections or injuries. On January 20 alone, over 200 students were examined at the student health center for gastroenteritis. The NMDH later confirms that this is an outbreak of cryptosporidiosis; this type of outbreak had last occurred 35 years ago. The incubation period of cryptosporidiosis is about 7 days. Follow-up studies showed that based on water consumption amounts, the infectious dose of cryptosporidium among the college students was 132 oocysts, whereas among the nursing home patients got infected consuming as little as one-twenty-fifth of the water amount; indicating that they were infected by as few as 5 oocysts. Why was there such a difference in the ID numbers in the two patient populations? Difference in immune capacities among patients. The cryptosporidium found in the nursing homes must have contained virulence genes whereas the cryptosporidium found in on the college campus did not. The college students drank more water and thus were exposed to higher doses of oocysts. They must have been different strains of cryptosporidium.
Josee P.
Giardia lamblia is a cyst-forming protist parasite that causes diarrhea if ingested. Given this information, against what type(s) of environments might G. lamblia cysts be particularly resistant?
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