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06 Jun 2024, 13:36
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Treating water supplies with chlorine for 30 minutes should be effective (99% inactivation) against the majority of the bacteria listed.: Yes
Water that is sealed away from sources of pathogens for more than 1 month will likely be free of each of these pathogens except viruses.: No
The pathogen that has the lowest health significance has the highest chlorine-resistance rating.: Yes
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
52% (03:11) correct
48%
(03:19)
wrong
based on 1754
sessions
History
Date
Time
Result
Not Attempted Yet
| Pathogen | Type | Helth significance^a | Persistnece in water supplies^b | Resistence to chlorine^c |
|---|---|---|---|---|
| Acanthamoeba spp. | protozoa | high | unknown | low |
| Adenoviruses | virus | moderate | long | moderate |
| Astroviruses | virus | moderate | long | moderate |
| Burkholderia pseudomallei | bacteria | high | unknown | low |
| Campylobacter jejuni, C. coli | bacteria | high | moderate | low |
| Crytosporidium parvum | protozoa | high | long | high |
| Cyclospora cayetanensis | protozoa | high | long | high |
| Dracunculus medinensis | helminth | high | moderate | moderate |
| E. coli-Enterohaemorrhagic | bacteria | high | moderate | low |
| Entamoeba histolytica | protozoa | high | moderate | high |
| Enteroviruses | virus | high | long | moderate |
| Escherichia coli-Pathogenic | bacteria | high | moderate | low |
| Giardia intestinalis | protozoa | high | moderate | high |
| Hepatitis A virus | virus | high | long | moderate |
| Hepatitis E virus | virus | high | long | moderate |
| Legionella spp. | bacteria | high | unknown | low |
| Naegleria fowleri | protozoa | high | unknown | low |
| Non-tuberculous mycobacteria | bacteria | low | unknown | high |
| Noroviruses | virus | high | long | moderate |
| Other salmonellae | bacteria | high | unknown | low |
| Pseudomonas aeruginosa | bacteria | moderate | unknown | moderate |
| Rotavirus | virus | high | long | moderate |
| Salmonella typhi | bacteria | high | moderate | low |
| Sapoviruses | virus | high | long | moderate |
| Schistosoma spp. | helminth | high | short | moderate |
| Shigella spp. | bacteria | high | short | low |
| Toxoplasma gondii | protozoa | high | long | high |
| Vibrio cholerae | bacteria | high | short to long | low |
| Yersinia enterocolitica | bacteria | moderate | long | low |
a. Health significance: Severity of impact, including potential for outbreaks
b. Persistence in water supplies: Short = less than 1 week; Moderate = 1 week to 1 month; Long = greater than 1 month
c. Resistance to chlorine (standard dose): Low = 99% inactivation in less than 1 minute; Moderate = 99% inactivation in 1–30 minutes; High = 99% inactivation in greater than 30 minutes
The table displays information about certain pathogens that could pose a health risk if present in drinking water.
For each of the following statements, if it is supported by the information in the table and its legend, select Yes. Otherwise select No.
ID: 100376
| Yes | No | |
| Treating water supplies with chlorine for 30 minutes should be effective (99% inactivation) against the majority of the bacteria listed. | ||
| Water that is sealed away from sources of pathogens for more than 1 month will likely be free of each of these pathogens except viruses. | ||
| The pathogen that has the lowest health significance has the highest chlorine-resistance rating. |
ShowHide Answer
Official Answer
Treating water supplies with chlorine for 30 minutes should be effective (99% inactivation) against the majority of the bacteria listed.: Yes
Water that is sealed away from sources of pathogens for more than 1 month will likely be free of each of these pathogens except viruses.: No
The pathogen that has the lowest health significance has the highest chlorine-resistance rating.: Yes
20 Jun 2024, 07:33
Kudos
Bookmarks
The two queries that have been asked above and solution.
Q.1. Treating water supplies with chlorine for 30 minutes should be effective (99% inactivation) against the majority of the bacteria listed.
Sort the table by resistance to chlorine.
For30 minutes: This means you have to scan for both low and moderate vs high. The number of low and moderate are higher. So, answer is yes.
Q.2. Water that is sealed away from sources of pathogens for more than 1 month will likely be free of each of these pathogens except viruses.
Sort the table by persistence in water.
All those under long would still be present as they can persist for more than a month. You can check that there are pathogens other than viruses that have long persistence. Hence, no.
Q.3. The pathogen that has the lowest health significance has the highest chlorine-resistance rating.
Sort the table by health significance.
Now the second query. The option talks of health significance but highest chlorine rating.
There is only one under low, so it has to be the lowest. However, for the second part we look at highest rating which is high. So true and yes.
Q.1. Treating water supplies with chlorine for 30 minutes should be effective (99% inactivation) against the majority of the bacteria listed.
Sort the table by resistance to chlorine.
For30 minutes: This means you have to scan for both low and moderate vs high. The number of low and moderate are higher. So, answer is yes.
Q.2. Water that is sealed away from sources of pathogens for more than 1 month will likely be free of each of these pathogens except viruses.
Sort the table by persistence in water.
All those under long would still be present as they can persist for more than a month. You can check that there are pathogens other than viruses that have long persistence. Hence, no.
Q.3. The pathogen that has the lowest health significance has the highest chlorine-resistance rating.
Sort the table by health significance.
Now the second query. The option talks of health significance but highest chlorine rating.
There is only one under low, so it has to be the lowest. However, for the second part we look at highest rating which is high. So true and yes.
12 Feb 2025, 06:37
Kudos
Bookmarks
guddo
Responding to a pm: How to do this quickly?
Treating water supplies with chlorine for 30 minutes should be effective (99% inactivation) against the majority of the bacteria listed.
Sort by "resistance to chlorine". Check the 'high' list. There is only 1 bacteria there. All other bacteria are low or moderate so they will become inactive in 30 mins.
Select Yes
Water that is sealed away from sources of pathogens for more than 1 month will likely be free of each of these pathogens except viruses.
Sort by "Persistence in water supply". Check the "long" list. Virus, bacteria and protozoa are present in that. Hence some protozoa and bacteria will also remain.
Select No
The pathogen that has the lowest health significance has the highest chlorine-resistance rating.
Sort by "health significance". There is only one "low" there - Non-tuberculous mycobacteria. Its resistance to chlorine rating is high, which is the highest resistance to chlorine rating.
Select Yes
