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Doctor insights on: Gram Negative Vs Gram Positive Bacteria Antibiotics

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What is meant by gram positive bacteria and gram negative bacteria?

What is meant by gram positive bacteria and gram negative bacteria?

Staining technique: Gram positive organisms have a high amount of material in their cell walls which retain gentian violet (a purple stain) on slides looked at under the microscope. Gram negative organisms have the gentian violet washed out when subjected to acid-alcohol and then they are restained with a red stain which renders them red under the microscope. It is one way of loosely classifying bacteria. ...Read more

Dr. John Leander Po
1,117 Doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more


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Please tell me can gram-negative bacteria test be positive in a catalase test, even if catalase tests are meant for gram-positive bacteria?

Please tell me can gram-negative bacteria test be positive in a catalase test, even if catalase tests are meant for gram-positive bacteria?

Catalase enzyme: Yes -many, many bacteria possess catalase. Classically the catalase test was used to distinguish Staph (+) from Strep (-), but there is a long list of bacteria that have it... includin Listeria, C diphtheriae, Burkholderia cepacia, Nocardia, the family Enterobacteriaceae (Citrobacter, E. coli, Enterobacter, Klebsiella, Shigella, Yersinia, Proteus, Salmonella, Serratia), Pseudomonas etc. ...Read more

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Is necrotising fasciitis caused by gram negative or gram positive bacteria?

Both: Necrotising fasciitis is usually caused by a combination of multiple bacteria that support each others growth and spread and causing serious tissue damage. ...Read more

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How would a doctor treat gram positive bacteria and a gram negative bacteria?

How would a doctor treat gram positive bacteria and a gram negative bacteria?

Infection: You treat the causative bacteria of infection with antibiotics that may be chosen after isolating the particular bacteria and testing to see if it is sensitive to being killed by that antibiotic. ...Read more

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Is bartonella henselae a gram-positive or negative bacteria?

Is bartonella henselae a gram-positive or negative bacteria?

Gram negative: Bartonella are small, fastidious, intracellular gram-negative bacteria. ...Read more

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Hello! In a sputum test, what do MODERATE GRAM POSITIVE COCCI, RARE GRAM POSITIVE RODS, FEW GRAM NEGATIVE RODS mean? My wife has CVID and is very ill.

Hello! In a sputum test, what do MODERATE GRAM POSITIVE COCCI, RARE GRAM POSITIVE RODS, FEW GRAM NEGATIVE RODS mean? My wife has CVID and is very ill.

Mgt: An inbox consultation may be made online to better advise. I would suggest a culture of the sputum, including a fungal culture. If your wife is ill, please have a chest imaging study and discuss iv broad spectrum antibiotics with your PCP. ...Read more

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Doctors, what is the difference between gram positive cocci & gram negative bacilli?

Gram stain: The gram stain has been used for a long time to classify bacteria according to the chemistry of their cell walls (and hence whether they are gram positive or negative.) Cell shape and growth characteristic are also useful in grouping bacteria until more full speciation information becomes available. The gram stain is fast, reasonably reproducible by trained personnel and the groupings useful 4 rx ...Read more

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My gram stain results: many gram negative rods, few gram positive cocci, strep.-like, rare wbcs. I completed a 10 day course of pcn, I still have s/sx?

My gram stain results: many gram negative rods, few gram positive cocci, strep.-like, rare wbcs. I completed a 10 day course of pcn, I still have s/sx?

UTI Rx: Let the doctor who prescribed the penecillin know your symptoms and urinalysis/urine culture results and leave the phone number of your pharmacy so a new prescription can be called in immediately. ...Read more

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Vaginal swab shows I have moderate gram positive bacilli and cocci moderate gram negative bacilli and few leucocyte. What does this mean?

Nothing: That is normal. This helps rule out a few things. If you are having symptoms, your physician will keep looking. ...Read more

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A friend of mine has urine test & resulted rare gram positive cocci & gram negative bacilli-what does this mean? She has very high fever as well.

A friend of mine has urine test & resulted rare gram positive cocci & gram negative bacilli-what does this mean? She has very high fever as well.

Fever: OK...this is likely contamination of the urine source. In most infections there will be the predominance of one bacterial species causing the issue...and there will be many per high powered field. In her case, there are 2 types and only rare (per high powered field) and you didn't mention any white blood cells either. This doesn't look like much to my eyes. ...Read more

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I had my vaginal discharge lab test and it says that gram postive bacilli ++++ and gram negative bacilli + gram positive cocci (singly and in pairs)?

I had my vaginal discharge lab test and it says that gram postive bacilli ++++ and gram negative bacilli + gram positive cocci (singly and in pairs)?

Urine culture: The results mentioned need analysis by your healthcare provider for determination of necessary treatment. Depending on the number of colonies seen, and the types of gram negative/positive bacteria (bacilli and cocci) appropriate antibiotics may be prescribed. ...Read more

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What are the diseases associated to a gram positive bacteria?

Gram-positive: There are many different gram+ bacteria. These include staphylococci, streptococci, bacillus and clostridial species, corynebacterium, listeria and many others. If you can be more specific rephrase the question and can list some conditions they may cause. ...Read more

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What is gram positive bacteria result from a urine culture test mean?

What is gram positive bacteria result from a urine culture test mean?

Urinary infection: Bacteria usually originate from the bowel, vagina, or skin as normal flora of the host.
Gram-positive organisms can include
staphylococcus saprophyticus (causative organism in 5% to 15% of utis) and
enterococcus faecalis it means urinary infection related to gram positive organism. ...Read more

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What are the common gram-positive bacteria?

What are the common gram-positive bacteria?

Staph and strep: Staphylococcus species such as staphylococcus aureus and streptococcal species such as streptococcus pyogenes are among the more common gram positive bacteria but there are many different kinds of gram positive bacteria in addition to those. ...Read more

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What exactly is three gram positive bacteria?

Probably +3 gram pos: Gram positive bacteria is a category of bacteria based on staining charicteristics under the microscope. Not sure what the 3 is (the third thing found in a sample or an ammount). ...Read more

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What are the risks of working with Gram-positive bacteria?

What are the risks of working with Gram-positive bacteria?

In what situation?: We as physicians come in contact with patients who have various gram positive infection without a fear of getting infected/There are other healthcare providers who deal with gram positive bacteria as well. The lab workers, nurses and technisians and they are trained to protect themselves especially from MERSA which is the worst Gram Positive Infection anywhere ...Read more

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What is the cellular arrangement of the gram positive bacteria, c. Xerosis?

Corynebacteria: Corynebacteria group together in a characteristic way, which has been described as the form of a "v", "palisades", or "chinese letters". ...Read more

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What is a gram positive bacteria that would cause hard, painful cyst down there?

An Infection: Gram positive bacteria are usually staph or strep infections. As the cystic pocket fills with the pus or bacteria it will start to become hard or firm over time. At this point antibiotics may not be helpful and therefore drainage or removal of the cyst is usually required. Don't let this drag on, as this will then start to damage some of the good tissues that are close to this area. ...Read more

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Are penicillins effective against gram-positive bacteria? Can't take sulfa, fluoroquinolones, or cephalosporins.

Are penicillins effective against gram-positive bacteria? Can't take sulfa, fluoroquinolones, or cephalosporins.

Penicillin are ok.: Penicillins are effective against gram + organism (G+), however you will need a culture to properly identify the bacteria.there is different type of penicillin base antibiotics and they can treat a variety of infections caused by (G+), such as otitis, pharyngitis, skin infection, etc. Again it will depend on the type of infection as well as the organism you are treating. Can also use tetracycline. ...Read more

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Incision still a bit red 4 wks post op on foot so dr did a culture. Preliminary results showed small growth of gram positive bacteria. Infected?

Hard to tell: Gram positive bacteria could be normal skin bacteria or could be sign of an infection. I would encourage you to contact your doctor if you think there is an infection. ...Read more

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What gram-positive bacteria grows in chains and acts like mrsa? Why would somebody infected with this bacteria need to have their limb amputated?

Strep. Pyogenes: Group a beta hemolytic streptococci or streptococcus pyogenes is a common cause of necrotizing fasciitis "flesh eating bug" infection. The treatment involves debridement of all necrotic fascia and other necrotic soft tissue and sometimes requires limb amputation. ...Read more

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I know Cipro (ciprofloxacin) is a broad spectrum antibiotic killing gram neg. & pos. Bacteria. What are the most common infections does it treat? & does it kill MRSA

Not good for MRSA.: Cipro (ciprofloxacin) is a fluroquinolone (FQ) drug that is mostly used for Gram neg. Infections that affect the GI tract, bladder, & some special infections that affect the head, neck, & respiratory tract. While it is effective againt some special, unusual Gram pos. bacteria, it does a poor job against Staph (like MRSA) or Strep. In fact, some evidence shows MORE nasal penetration by Staph when pts take FQ Abx. ...Read more

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Which is the most acurat antibiotic to killstap aueras cauglase positive mssa in prostrate and gram positive cocci.

Which is the most acurat antibiotic to killstap aueras cauglase positive mssa in prostrate and gram positive cocci.

Prostatitis: MSSA Prostatitis is vey uncommon. Need to know sensitivities. In general mssa is sensitive to multiple antibiotics including penicillin derivatives. Bactrim, cipro (ciprofloxacin) and levaquin has better penetration to prostate comparing to others. Prostatitis especially chronic may require extended course of treatment: 3-6 months sometimes to see complete resolution of symptoms ...Read more

Bacteria (Definition)

Are omnipresent single celled organisms which are the both the simplest form of life and the original form of life on earth. The are ...Read more