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Doctor insights on: Ecoli On Macconkey Agar

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Cled medium preferred over mcconkey agar in UTI because?

Cled medium preferred over mcconkey agar in UTI because?

Bacteriology: Cled medium helps to prevent swarming of proteus over the surface of the plate. When this occurs it can overgrow and prevent identification of other organisms which may have been present. Am unaware that there is universal acceptance that this is preferred over mcconkey, and am also not familiar with the frequency with which proteus creates a problem. ...Read more

Dr. Marc Basson
1,099 doctors shared insights

Escherichia Coli (Definition)

Escherichia coli is a gram-negative, coliform bacterium. There are various strains of E. coli that live in the intestines . Some strains can cause severe abdominal cramps, ...Read more


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Reason why nail scrapping of a client on sabouraud dextrose agar yielded fungal growth?

Reason why nail scrapping of a client on sabouraud dextrose agar yielded fungal growth?

Fungus: Fungus may be either infecting the nail or colonizing it. We carry a lot of fungi and bacteria on our skins and nails which not always cause infection. Not sure what a client means and how you incubated the scrapings, consult a dermatologist if in doubt. ...Read more

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Got some pseudomonas aeruginosa broth on my hand and book in Microbiology Lab. Should I be worried? Washed hands

Got some pseudomonas aeruginosa broth on my hand and book in Microbiology Lab. Should I be worried? Washed hands

Washed hands: Relax! If you are washing your hand everything should be OK! I am an Endocrinologist in Michigan since 1976 and still working at age 72. Doing OK with the lab work in addition to patient care. If you are working in the Microbiology lab consider staying in the field for decades! ...Read more

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Corynebacterium species was found in my wound culture. What does this mean?

Corynebacterium species was found in my wound culture. What does this mean?

Contaminant: Most likely it is a microbe that just happened to be present rather than one causing infection. Your physician can address this with you. ...Read more

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Pregnant. Spilled few drops of raw beef juice on floor & forgot to clean b4 it dried. Scared bacteria was treked thru house & entered body. Possible?

Pregnant. Spilled few drops of raw beef juice on floor & forgot to clean b4 it dried. Scared bacteria was treked thru house & entered body. Possible?

No worries: Our grandmothers, great grandmothers, great great grandmothers, and all the great women before them... All handled and cooked meat during pregnancy. They likely had to kill and gut animals with their bare hands. We humans are sturdy enough to not have to worry about the little things around us in our everyday lives, and just enjoy each day as it comes. ...Read more

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How long does it take for streptococcal pharyngitis to grow on agar in petri dishes?

How long does it take for streptococcal pharyngitis to grow on agar in petri dishes?

Up to 2 days: Generally if it hasn't grown in 2 days or less then it is not going to. A throat culture would be considered negative after no growth in 48 hours. ...Read more

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Rinsed safety pin with warm water (had been sitting on my deck for over a week.) Pricked myself w/pin 3x &drew blood. Could this cause HIV infection?

Rinsed safety pin with warm water (had been sitting on my deck for over a week.) Pricked myself w/pin 3x &drew blood. Could this cause HIV infection?

No: You're an adult now, and you need to be accurately informed about the basics of HIV infection. You can't get it except from another person who's actively infected, and it needs to be very fresh blood or other body fluid. Life is difficult enough without these fears. Best wishes. ...Read more

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How could clostridium botulinum be cultured on agar?

How could clostridium botulinum be cultured on agar?

Huh?: You don't want to do that, otherwise you will have federal authorities knocking on your front door with a warrant for your arrest. ...Read more

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What negative effects do e.coli k12 and staphylococcus albus have on humans?

What negative effects do e.coli k12 and staphylococcus albus have on humans?

None: Generally none. These are normal bacteria in the gastrointestinal tract and on the skin, respectively. They infrequently cause infection or other health problems. ...Read more

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Why mycobacteria tuberculosis cannot be cultured on blood agar?

Why mycobacteria tuberculosis cannot be cultured on blood agar?

TB culture: Tb is difficult to culture and culture results often take months. Lowenstin-jensen and middlebrook agars are the culture medias used to grow tb. ...Read more

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Hi Dr. Smith. How is e. coli introduced into the throat?

Hi Dr. Smith. How is e. coli introduced into the throat?

Auto-inoculation: E coli is normal in our intestines; everyone has it. If in the throat, it usually gets there by auto-inocuation, i.e. someone's own hands from poor toilet hygiene, then touching the mouth or lips. Also more common in special circumstances, like being in the hospital, taking antibiotics, or immune suppression, e.g. by advanced cancer or other illnesses. ...Read more

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Does e. Coli contaminate all meats or just ground beef?

Does e. Coli contaminate all meats or just ground beef?

All foods: E. Coli can contaminate any food, not just meats. Lettuce, tomatoes are known to have been contaminated. ...Read more

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How bad is a urine culture: >100, 000 cfu/ml escherichia coli?

How bad is a urine culture: >100, 000 cfu/ml escherichia coli?

This is the cut off: Point for a bacterial growth from the urine sample to be clinically significant . However, it does not have any relevance as far as severity or prognosis ...Read more

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Im from srilanka, at a friend's place their rottweiler jumped on by brothr and made a scratch on his arm with its claw it broke the skin wat shud I do?

Im from srilanka, at a friend's place their rottweiler jumped on by brothr and made a scratch on his arm with its claw it broke the skin wat shud I do?

Rottweiler: Sorry this happened. Please have the brother taken to the nearest Emergency facility. Hope all goes well - please keep me posted. ...Read more