Facebook Pixel Code
x
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Pathogenic Microbes from the Environment in a Human Body

This is a preview of the 7-page document
Read full text

Bacteria isolated from vaginal swab 2 (V2) exhibited a positive gram reaction and was found to be cocci dividing into multiple planes. This is indicative of a Staphylococci (Kloos & Schleifer, 1975). Further, the irregular, curled, raised, medium and yellow colonies are suggestive of Staphylococcus aureus. The yellow colour of the colony rules out Staphylococcus epidermidis which has white colonies (Sandwik & Brown, 1965). Next, V2 shows alpha haemolytic activity, which again suggests it to be Staphylococcus. aureus, since none of the other staphylococci, shows haemolytic activity (Marcus et al. , 1997).

It shows no change in colour on MacConkey agar, which further substantiates the conclusion that it is a gram-positive bacteria (Fluornoy, 1900). Growth on mannitol agar is indicative of V2 being either a Staphylococci or a Micrococci and the colour change of the media is indicative of coagulase-positive staphylococci, S. aureus (Koch, 1942). Next, a positive catalase test rules out the possibility of V1 being streptococci or enterococci, which are catalase-negative (Taylor & Achanzar, 1972). Thus on the basis of V2 having the capacity to ferment mannitol it can safely be concluded that it is S.

aureus. S. aureus is a normal flora found on the skin of humans and infection occurs only in cases of invasion through a lesion present on the skin due to previous trauma. However, S. aureus has been isolated from Urinary tract of humans (Muder et al. , 2006), and has been found to be a cause of symptomatic UTI in some cases. S. aureus is resistant to most antimicrobial agents: ampicillin, chloramphenicol, tetracycline, cephalothin, clindamycin and can only be treated with gentamycin. FAECAL SAMPLE (F): Bacteria isolated from the faecal sample (F), showed a gram-negative reaction and is also a bacillus.

This result excludes the gram-positive and the cocci. The colonies are round, flat, entire, small and cream, which is suggestive of bacteria being either coliform or Salmonella.  

This is a preview of the 7-page document
Open full text
Close ✕
Tracy Smith Editor&Proofreader
Expert in: Biology, Systems Science, Other
Hire an Editor
Matt Hamilton Writer
Expert in: Biology, Anthropology, Astronomy
Hire a Writer
preview essay on Pathogenic Microbes from the Environment in a Human Body
WE CAN HELP TO FIND AN ESSAYDidn't find an essay?

Please type your essay title, choose your document type, enter your email and we send you essay samples

Contact Us