Last updated: July 16, 2019
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Urinary piece of land infection ( UTIs ) are common bacterial infections that occur in the urinary piece of land which is one of the most susceptible sites for bacterial infections. Bacterial infections caused by pathogens like Eschrichia coli besides contribute to community acquired infections. In comparing to the hospital- acquired infections the community- acquired UTIs are more common.Females are largely affected by Urinary piece of land infections when compared to males which is due to the differences in the anatomy of the urethra every bit good as the age, gestation, sexual activity and catheterization. UTI occurs in 20 to thirty per centum of females in latter life. The infections are extracellular infections that are short lived and look to be an acute status. However, the morbidity rate of the UTI is important in the population as the kidneys can be infected by the pathogen which can take to a really serious infection. Drawn-out infections can ensue in utmost effects. Therefore, it is indispensable to place the being ( s ) that lead to UTIs, in order to supply patients with the right antibiotics to handle their infection. UTI in females occur in the vesica known as Cystitis, in urethra known as urethritis and in the vagina known as vaginitis. The bacterial infection occurs in the urinary piece of land along the urethra and moves to the kidneys.

This experiment involved the mid watercourse piss samples ( MSU ) collected from patients affected with UTIs. The MSU is frequently collected from the center of the vesica as taint might take topographic point at the initial portion of the piss that flows through the baldder. MSU is of import for a civilization and the MSU trial allows a confrimed diagnosing for a urine infection and allows the intervention by finding the most suited antibiotics required to move against the bacterium.

There purposes of the three practicals ( A, B and C ) were to:

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Examine samples utilizing a microscope,

Identify and analyze the clonies present in CLED agar,

Identify the bacterial strains present in the six clinical samples,

Identify isolated bacterial pathogens by ID trial,

Use Cowan and Steels Manual to find the genus of the bacterial pathogens.

Use the two commercial systems ( API-20E and BBL Enterotube II ) to find the enterobacteriae species.


There were no alterations made to the method subdivision. Laboratory coats and baseball mitts were worn when handeling the samples during the experiment. Please refer to the agendas provided for the method of the three practicals.


Table 1:

The MSU were changed so alter the consequences, ask ema about the antibiotics table..


Number of ruddy blood cells ( RBCs/ml )

Number of white blood cells ( WBCs/ml )

Description of microscopic scrutiny and observation by oculus

Colonies organizing units/ml on CLED agar

Description of settlements observed on CLED agar

Gram discoloration


7.0 x 106

10.6 x 106

Motile ;

Strong smell,

& A ; gt ; 1.0×105

& A ; gt ; 100, xanthous settlements






Uric acid crystals observed ; Dark brown colored piss,

& A ; gt ; 1.0×105

& A ; gt ; 100, Yellow settlements






Clear piss

& A ; gt ; 1.0×105

& A ; gt ; 100, Green colonies with white run, glistening texture, irregular form of settlements




2.5 x 104


Cloudy piss ;


& A ; gt ; 1.0×105

Yellow, little settlements




4.0 x 105

2.5 x 105

Cloudy piss


No growing



3.0 x 105


Few epithelial cells present ;

Dark coloured urine

& A ; gt ; 1.0×105

Green, different sizes of settlements,



Table one:

The consequence tabular array of the urinary piece of land infection practical B ( Identification ) is attached to this practical study.

MSU sample

Cowman and Steel ID


Enterobacteriaceae: Escherichia coli


Staphylococcus aureus


Enterobacteriaceae: Klebsiella Pneumoniae



Mycobacteria TB


Pseudomonas aeruginosa

Check: MSU 4: Enterococcus saecalis


By utilizing the consequences the six surveies can be solved.

Case 1: The genus of the bacteriums in MSU 1 is found to be Escherichia coli. The pathogen belongs to Enterobacteriaceae household. By transporting the API-20E commercial trial the species was found to be E.coli based on the API-20E. The infection might be transmitted by touch for illustration contacting public toilets. The consequences indicate that the patient is affected with impaired nephritic map.

Case 2: The genus of the bacteriums determined in the MSU 2 sample is found to be Staphylococcus and the species is the S.aureus. Due to the gestation of the patient, her immune system could hold been weak and this might hold led to the adult females being susceptible to this infection.

Case 3: The genus of the bacteriums in the MSU 3 sample is Klebsiella which is found to belong to the Enterobacteriaceae household. Based on the consequences found from the BBL Entertube II commercial trial the species is found to be K. Pneumoniae. The possible disease of this patient can be pneumonia. The cause of this infection can be due to fire on the patient & A ; acirc ; ˆ™s leg which may hold resulted in cellulitis or sepsis. Cathetherisation might hold increased the possibility of UTI in the patient. The patient might hold been affected by Gram positive aerobes in the yesteryear as the patient was treated with Amoxil ( when looking at the patient & A ; acirc ; ˆ™s history ) .

Case 4: MSU 4 was identified as Streptococus, Enterococcus or Lactococcus, the patient is a 30 twelvemonth old adult female, who has abdominal strivings, frequence and dysuria. Enterococcus faecalis is the possible pathogen, it is a common cause of UTIs, as it is usually found in the GI piece of land, but can come in the urinary piece of land during intercourse. Streptococcus is causes hematuria there was no evident of this in the macroscopic probe, there was besides no evident to indicant that Lactococcus causes UTIs. They believe they might be pregnant ; a gestation trial would necessitate to be carried out to find this.

The genus of the bacterium found in MSU 4 sample is Enterococcus and the species is E. Faecalis which is one of the chief causes of nasocomial infections.

This pateint is expected to be affected with Cystitis which can be diagnosed in this patient. The factors that can do this type of infection includes sexual intercourse which might hold entered the urethra from vagina or anus. By the wiping following bowel motion can take to bacteriums from go throughing into the urethra.

Case 5: The genus of the bacteriums in MSU 5 sample is found to be Mycobacterium and the species is M. TB. The disease that can be diagnosed in the patient is Nephritic TB. White blood cells as good ruddy blood cells present in the sample when examined microscopically indicates pyuria and hematurias ( blood nowadays in the pateint & A ; acirc ; ˆ™s phlegm ) that refers to an infection.

Case 6: The genus of the bacteriums in MSU 6 sample is found to be Pseudomanas and the species is P.aeruginosa. Due to the history of recurrent of UTI of the patient, there is a possibility that the patient is immunocompromised.


Example for MSU 1

White blood cells ( WBC ) = 1136 cells counted

= 1136 x 10= 11360

= 11360 ten 1000

= 11360000 WBCs/ml

Red blood cells ( RBCs ) = 700 cells counted

= 700 tens 10= 7000

= 7000 ten 1000

= 7000000 RBCs/ml


The figure of settlements observed in CLED agar for the MSU 1,2,3,4 and 6 samples were & A ; gt ; 1.0×105. This indicates the presence of an infection.

Case 4: The bacteria in this instance was found to be gram negative, rod shaped, grew both in anaerobically and in air. The consequences indicated that the bacteriums belongs to Enterobacteriae household. By transporting out the commercial trial the species was identified as Escherichia coli. The high chance ( 96.5 % ) agrees with the type of species identified. By analyzing the sample through microscope indicated hematuria and pyuria which is related to cystitis. Beta-lactam antibiotics

Case 2: Staphylococcus aureus

The pathogen identified in MSU 2 was a spherical shaped, positively stained bacteriums which grew both in air and anaerobically. The consequences indicate that the bacteriums belongs to Staphylococcus genus. Therefore, by making a catalase trial the bacteria was found to be Staphylococcus and non Enterococcus bacteriums.

Case 3: Klebsiella Pneumoniae

The bacteriums identified in this instance survey was a negatively stained, rod shaped bacteriums which grew in air and anaerobically. The consequences indicated that the bacterium is K. Pneumoniae. Vesicoureteric reflux in the patient is one of the possible cause that led to nephritic harm. However, symptoms such as febrility and hurting on micrurition possibly declarative of pyelonephritis in the patient.

Case 4: Enterococcus saecalis

This species is a commensal bacteria that is found in the enteric piece of land. The species is a gram negative bacteriums which is spherical shaped. By futher making the catalase trial and oxidase trial, the bacteriums resulted negative which are consistent its characteristic. The symptoms of the patient ( dysuria, abdominal hurting and dysuria ) in this instance survey is common in UTI.

Case 5: Mycobacteria TB

The pathogen found in MSU 5 is M.tuberculosis which can non be seeable on a routined standard media. Therefore, there was no growing observed on the CLED agar. The designation of the species was supported by detecting the non-sporing acid fast bacilli with Ziehl-Neelsen discoloration. The coughing of blood by the pateint indicates that the patient is affected with nephritic TB which associated with painless hematurias.

Case 6: Pseudomonas aeruginosa

Due to different sizes of the settlements on the CLED agar, there were four genus identified which included Janthinobacterium, Agrobacterium and Achromobacter. A gram negative bacili observed was identified as pyocanin by P.aeruginosa & A ; acirc ; ˆ™s ( green settlements ) . The bacteriums can be farther identified by proving the fruity smell of the bacterium. The bacterium is able to colonize on cathethers which in the patient can take to a high hazard of UTI.

Alternate methods: Extra trials and the importances of ID and antibiotic sensitiveness trials

Polymerase concatenation reaction ( PCR ) is an effectual method used in observing pathogens. In add-on, bacteriums such as M.tuberculosis can be identified by this technique. It does this by magnifying the Deoxyribonucleic acid in a bacterium and bring forthing several 1000000s of transcripts of the certain DNA sequence. Coagulase trial must be used besides it to corroborate the presence of Staphylococcus. If positive consequences are produced the bacterium is identified as S.aureus meanwhile if a negative consequence is produced the species is identified as S.saprophyticus or S. epidermidis. If positive consequence obtained, a farther oxacillin trial can be carried out to find if methicillin-resistant Staphylococcus aureus ( MRSA ) is present. Meanwhile, Vancocin can be used in the antibiotic sensitiveness proving to place the presence of vancomycin-resistant enterococcus. In the other manus, K. pneumoniae has a typical feature which is opposition to ampicillin. Antibiotic sensitiveness testing is important to look into the susceptibleness of a pathogen to a scope of possible effectual agents. A peculiar antibiotic or a scope of antibiotics which inhibit the growing of the bacteriums may supply extra information on the designation and act as a collateral trial for the presumptive designations. Possible human mistakes might hold occurred throughout these experiments which may hold influenced the consequences obtained.

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