Coliform Bacteria: Occurrence and Antibiotic Susceptibility

Coliform Bacteria: Occurrence and Antibiotic Susceptibility Abstract   Bacteriological contamination of muscles and digestive tract contents of Oreochromis sp. and Labeo sp. reared in a pond supplied with domestic sewage was enumerated followed by determination of resistance of thermotolerent coliforms for antibiotics. Numbers of bacteria in muscles and digestive tract contents of fish reflected their densities in water. Muscles of both the fish species contained high numbers of total coliforms (TC) and fecal coliforms (FC). Escherichia Coli (E.coli) were never recovered from the muscles but from the digestive tract contents of the fish. Ranking of the total and fecal coliform contamination levels showed a decrease in the order digestive tract contents> muscles (p Keywords: Domestic sewage; Fish; Fecal coliforms; Escherichia coli; Water quality; Antibacterial resistance; Public health. Introduction All around the world, people both in rural and urban areas have been using domestic wastes to fertilize fish ponds (Strauss et al. 2000). In the majority of cases, domestic sewages are applied untreated or only partially treated through storage (Strauss 2000). Domestic wastewater, rich in nutrients, used in aquaculture supports the growth of plankton and other microorganisms which are consumed by the fish with little intake of other supplemented feed. Recycling of domestic sewage through aquaculture is an effective form of pollution control, which contributes to cost recovery and provides a source of low cost animal protein production. Domestic sewage transports a variety of human pathogenic microorganisms which may contaminate fish flesh when fish is grown in ponds receiving waste water (Niewolak and Tucholski 2000). Besides, municipal wastewater consists of huge amounts of incompletely metabolized antimicrobial drugs which can lead to the development of antibiotic resistant bacteria as well as resistant plasmids (Wiggins et al. 1999). The prominently affected bacteria are members of enterobacteriaceae and related gram negative rods (Kelch and Lee 1978). One of the important concern of wastewater fisheries is the contamination of fishes by fecal coliforms (Fapohunda, MacMillan, Marshall and Waites 1994). Their presence in fish intended for human consumption may constitute a potential danger not only by causing disease but also because of the possible transfer of antibiotic resistance from aquatic bacteria to human-infecting bacteria from nonaquatic sources (Olayemi, Adedayo and Ojo 1991). Therefore, periodic and c omprehensive sanitary survey of wastewater fishery is required. For years, the group of fecal (also called thermotolerant) coliforms (FC) has been the most widely used as fecal contamination as their excreted load is similar or larger than that of pathogenic organisms, and their survival time in the environment longer than that of excreted bacteria and viruses (Strauss 1997). In the present study, an attempt has been made to determine the bacteriological contamination of muscles and digestive tract contents of Oreochromis sp. and Labeo sp. reared in wastewater fed pond. Resistance to two very common antibiotics for random thermotolerent coliform isolates from muscle and digestive tract contents of both the fish was also determined. Materials and Methods Study Site A sewage fed pond of Bandipur, Rahara, North 24 Parganas, (22 °44N Latitude and 88 °24E Longitude) was taken into consideration for this study and to examine bacterial load of water and fish. Raw sewage was entirely of domestic origin, coming from Titagarh town of North 24 Parganas, West Bengal. Sampling and Dissection Fish samples were caught with a net and were immediately transferred to the laboratory in containers with pond water. They were dissected according to Buras et al. 1987. Muscles and digestive tract contents were isolated and placed in sterile glass vessels. The tissues were weighed under sterile conditions, ground in a mortar and suspended in sodium chloride (NaCl) physiological solution (10 ml of the solution for each 1 g of the muscle or digestive tract content). The suspensions were homogenized using Universal Laboratory Aid Type MPW-309 homogenizer, at 1000 rpm, for 10 minutes. The homogenates were then serially diluted (10-1 to 10-6 for muscles and 10-1 to 10-7 for digestive tract contents) and inoculated into culture media. Time lag from fish collection to the analyses did not exceed 6 hours. Water from sewage-supplied pond was sampled and analysed simultaneously with fish sampling. Samples were collected monthly from July 2009 to September 2009. Microbiological Analyses Total Coliforms Lauryl Tryptose (LT) Broth at 350C for 48 hr was used for three-tube most-probable-number (MPN) presumptive determinations of coliforms (APHA 1998). From all positive presumptive tubes, total coliforms were confirmed by the formation of gas in any amount in the Durham fermentation tubes of brilliant green lactose bile broth (BGLB) for 48 hr at 350C. Fecal Coliforms and E.coli All positive Lauryl Tryptose (LT) MPN tubes to tubes of Escherichia coli (EC) Broth followed by incubation at 44.50C for 48 hr constitute a positive fecal coliform test. The growth from positive EC tubes was then streaked onto Levine Eosin Methylene Blue (EMB) Agar plates and incubated at 35 °C for 18 to 24 h. Colonies from EMB Agar plates typical of E. coli were transferred to Nutrient agar (NA) slants from which GIMViC tests were performed where G-medium is the secondary EC broth, I -medium is Tryptone broth, M- and V-medium is Buffered Glucose broth, and C-medium is Simmons Citrate agar. MPN of E. coli was then computed based on the number of tubes found to contain isolates that produce GIMViC reaction patterns characteristic of E. coli (APHA 2001). Representatives of typical thermotolerent coliform isolates from fish samples were selected randomly by colony morphology on Eosin methylene blue agar and were streaked aseptically several times on freshly prepared nutrient agar plates to obtain pure isolates (Ogbonna, Sokari and Amaku 2008). Nutrient agar plates were then supplemented with ampicillin (50 µg ml-1) and tetracycline (25 µgml-1) and were used to evaluate antibiotic susceptibility patterns of 117 pure isolates (Miranda and Zemelman 2001). 32 isolates from muscles and 24 isolates from digestive tract contents of Oreochromis sp. and 39 strains from muscles and 22 isolates from digestive tract contents of Labeo sp. were subjected to antibiotics sensitivity test. Statistical Analyses Means and standard errors (SE) were calculated. T test was performed between bacterial concentration of muscles and digestive tract contents of both the fish. A significance level of 5% was considered (Zar 2007). Results Bacterial loads in muscles and digestive tract contents of Oreochromis sp. and Labeo sp. were exceptionally high. Total coliforms and fecal coliforms were commonly found in all analysed fish tissues. Escherichia Coli were not found in the muscles of either fish. Additionally, however, thermotolerant Escherichia coli were present in the digestive tract contents of both the fish (Table 2). Bacterial loads in the fish were significantly higher (p Antibiotic resistance pattern Of the 117 thermotolerent coliform isolates examined for antibiotic sensitivity, 82% (96 isolates out of 117) were tetracycline resistant and 65% (76 isolates out of 117) were ampicillin resistant. 58.11% (68 isolates out of 117) of the total isolates were resistant to both antibiotics where as 31% (36 isolates out of 117) were resistant to single antibiotic. From the single antibiotic resistant isolates, 24% were tetracycline resistant and 7% were ampicillin resistant (Figure 1). 56.41% isolates (22 isolates out of 39) from flesh and 22.72% (5 isolates out of 22) from digestive tract contents of Labeo sp. showed resistance to both antibiotics whereas 71.87% isolates from flesh (23 isolates out of 32) and 75% (18 isolates out of 24) from digestive tract contents of Oreochromis sp. showed resistance to both ampicillin and tetracycline (Figure 2). Discussion Comparison of fecal coliform counts of water of Bandipur sewage fed fish pond with WHO (World Health Organization) water quality criteria (WHO 1989) suggests considerable contamination of the first. Bacterial flora of fish reflects the bacteriological quality of the water from where the fish harvested (Geldrich and Clarke 1966). Strong correlation between the bacterial species present in the pond water and the fish regardless of the type of fish were also reported by Buras et al. 1987; Ogbondeminu 1993; Apun, Yusofand and Jugang 1999. Thus, in our study, total coliforms, fecal coliforms and E.coli recovered from muscles and digestive tract contents of Oreochromis sp. and Labeo sp. may reflect bacteriological water quality of the Bandipur sewage fed pond. Fecal coliforms in fish muscles were recovered when values of FC in water were 3.86+3.63105 MPN 100 ml-1 which were much higher than those recommended by WHO (1989) in its health guidelines on wastewater use in aquaculture. Fecal coliforms in fish reflect the level of pollution of their environment, as the normal floras of fish do not include coliforms (Cohen and Shuval 1973). Presence of fecal coliforms indicates the presence of fecal material from warm-blooded animals. However, thermotolerent coliforms include the genera of fecal as well as non fecal origin. E. coli is a species of fecal coliform bacteria that is specific to fecal material from humans and other warm-blooded animals (Bhatia 2008). Environmental Protection Agency (1992) thus recommends E. coli as the best fecal indicator of health risk from water. No detectable penetration of E.coli in muscles of either fish was found at 1.34+0.95104 MPN 100 ml-1 of E.coli concentration in water of sewage fed pond (Table 1). Thus, th e fish flesh qualities at harvest were good on the basis of their E. coli counts. Safety precautions during fish processing are still needed to avoid cross-contamination due to high accumulation of microorganisms in the digestive tract of fish. In this study significantly higher numbers of bacteria (p A wide range of thermotolerent coliforms isolated from sewage fed fish showed resistance to both ampicillin and tetracycline. Multiple anitibiotic resistant faecal coliforms have been observed in wastewater across the world (Gallert et al. 2005). Antibiotic resistance among random bacterial isolates from different organs of fish captured from fecally contaminated water with a full range of resistance (00-100%) to different common antibiotics of therapeutic and prophylactic use among human beings and in various animal farms and fish farms was reported by several authors. (Rhodes et al. 2000; Miranda and Zemelman 2001; Pathak and Gopal 2005). Thus the source of the problem of antibiotic resistance bacteria in wastewater pond of Bandipur was fecally contaminated water. Among thermotolerent coliforms recovered from fish, resistance to ampicillin and tetracycline was found in 65% and 82% of the isolates, respectively. Occurrence of thermotolerent coliforms with high resistance to ampicillin and tetracycline reflect human influence in the environment (Andersen and Sandaa 1994). Domestic sewage enters into the pond environment of the sewage fed farm with huge antibiotics which are used as medicines, as growth promoters or as preventative maintenance and may have established a selective pressure due to a slow degradation of antimicrobials favouring further growth of antibiotic-resistant bacteria (Petersen and Dalsgaard 2003). It may possible that these antibiotic resistant bacteria from wastewater may transfer their antibiotic resistant determinants to indigenous flora of fish, provoking their spread and prevalence in aquatic environment. In the present study bacteria resistant to both ampicillin and tetracycline from digestive tract contents were higher in Oreochromis sp. than in Labeo sp. It may be related to detritus feeding habit of Oreochromis sp. by which it is more exposed to wastes as well as antimicrobials than Labeo sp. which is a column feeder. Similar findings were reported by Miranda and Zemelman (2001) with demersal and pelagic fish. Antibiotic resistant fecal bacteria form domestic sewage may change nutritionally beneficial intestinal microflora with unexpected consequences on fish health. Our study indicates that fish flesh qualities were satisfactory in terms of E.coli counts. In spite of that flesh of both fish showed high numbers of antibiotic resistant thermotolerent coliforms which may include Klebsiella spp., Citrobactor spp. and Enterobacter spp. (non fecal origin) but till have immense ecological and public health implications specially if the resistance is plasmid mediated then there could be a problem associated with the transfer of resistance determinants to human pathogenic bacteria which may enter in human population through fish consumption. According to Walia et al. (2004) antibiotic resistance genes against ampicillin, streptomycin, and tetracycline are known to be transferable to other bacteria. Thus, we can say that Wastewaters and fishes reside there are potent source of antibiotic-resistant bacteria, which in turn may transfer their resistance genes to nonresistant bacteria (Schwartz et al. 2003). Several studies indicate that the environmental conditions in wastewater may enhance the likelihood of gene transfer (Pote et al. 2003). Mach and Grimes (1982) demonstrated the high transfer frequencies of enteric bacteria in a wastewater. Additionally resistant bacteria may pose a risk of therapeutic problems to public health and fish population. So the study demands an elaborate investigation on the members of predominant multidrug resistant bacterial microflora associated with sewage fed fishery along with their plasmids profile as an evidence of conjugal transfer of antibiotic resistance genes in human and animal food chain through fish consumption.

Boeing:how low can they fly? Essay

Prepare problems 3, 5 and 7 on pp.521 and the additional problem, Principles of Economics, Case, Fair and Oster. Problem 3 p.521 For each of the following statements, decide wether you agree or disagree and explain your answer : 1. During period of budget surplus (when ? < ? ), the government debt grows. 2. A tax cut will increase the equilibrium level of GDP if the budget is in deï ¬ cit but will decrease the equilibriumm level of GDP if the budget is in surplus. 3. If the ? ? ? = 0.90, the tax multiplier is actually larger than the expenditure multiplier. Problem 5 p.521 Expert economists in the economy of Yuk estimate the following : Real output/income 1000 billion Yuks Government purchases 200 billion Yuks Total net taxes 200 billion Yuks Investment spending (planned) 100 billion Yuks Assume that Yukers consume 75 percent of their disposable incomes and save 25 percent. 1. You are asked by the business editor of the ? to predict the events of the next few months. By using the data given, make a forecast. (Assume that investment is constant.) 2. If no changes were made, at what level of GDP (? ) would the economy of Yuk settle ? 3. Some local conservatives blame Yuk’s problems on the size of the government sector. They suggest cutting government purchases by 25 billion Yuks. What effect would such cuts have on the economy ? (Be speciï ¬ c) 1 Problem 7 p.521 Assume that in 2008, the following prevails in the Republic of Nurd : Y=200$ C=160$ S=40$ I(planned)=30$ G=0$ T=0$ Assume that households consume 80% of their income, they save 2% of their income, ? ? ? = 0.8 and ? ? ? = 0.2. That is, ? = 0.8 and ? = 0.2 . 1. Is the economy of Nurd in equilibrium ? What is Nurd’s equilibrium level of income ? What is likely to happen in the coming months if the government takes no action ? 2. If 200$ is the  « full-employment  » level of ? , what ï ¬ scal policy might the government follow if its goal is full employment ? 3. If the full-employment level of ? is 250$, what ï ¬ scal policy might the government follow ? 4. Suppose ? = 200$, ? = 160$, ? = 40$ and ? = 40$. Is Nurd’s economy in equilibrium ? 5. Starting with the situation in part (4), suppose the government starts spending 30$ each year with no taxation and continues to spend 30$ every period. If ? remains constant, what will happen to the equilibrium level of Nurd’s domestic product (? ) ? What will the new level of ? and ? be ? 6. Starting with the situation in part (4), suppose the government starts taxing the population 30$ each year without spending anything and continues to tax at that rate every period. If ? remains constant, what will happen to the equilibrium level of Nurd’s domestic product (? ) ? What will the new level of ? and ? be ?. How does your answer to this question differ from your answer to question (5) ? Why ? 2 Additional problem INCOME 2000 3000 4000 5000 6000 7000 8000 9000 10000 TABLE 1 – Add caption TAX C G I 200 1400 1600 1000 200 1900 1600 1000 200 2400 1600 1000 200 2900 1600 1000 200 3400 1600 1000 200 3900 1600 1000 200 4400 1600 1000 200 4900 1600 1000 200 5400 1600 1000 ? 1. Fill in the disposable income ( ) and the saving (?) columns. 2. Deï ¬ ne  « equilibrium income/output  » and then ï ¬ nd the equilibrium income / output by two different methods. 3. Deï ¬ ne ? ? ? and ? ? ?, and ï ¬ nd their numerical value. 4. How much is the : – Government expenditure multiplier ? What is the formula ? – Consumption multiplier ? What is the formula ? – Investment multiplier ? What is the formula ? – Tax multiplier ? What is the formula ? 5. From the above data : – Derive the consumption equation – Derive the saving equation – Derive the investment equation – Derive the government expenditure equation 6. What will be the new equilibrium income when the government increases its expenditure from 1600 to 3100 ? 7. What will be the new equilibrium income when the government increases the taxes from 200 to 1200 ? 8. Assume that the equilibrium level on income/output is the one found in question (2) above. If the potential income/output is 9000 and the government intends to bring the economy to the potential level : – By how much government expenditures should increase/decrease ? Explain. – By how much taxes should increase/decrease ? Explain. 3

How to Choose Tkam Argumentative Essay Topics

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Alexander The Great, King Of Asia - 2104 Words

Alexander the Great, King of Asia, King of the Four Quarters of the World, King of Babylon, King of Macedonia, etc. Born in 356 B.C., he died in 323 from a sickness at age 32. In Alexander’s short life he became one of the best military tacticians in the world. His military genius allowed him to create and rule an enormous Western empire in the ancient world. He was successful in all his military endeavors and his empire, stretching from Greece to India, shows that. He changed the course of history with all that he did. Without Alexander we wouldn’t have the Alexandria Library and many other things. He created a new culture which was a combination of Greece and Persia cultures, new or improved war tactics, changed the way people thought and so much more. He may have had a short life, but that didn’t stop him. He managed to do so many wonderful things that his legend and legacy still live on today. 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