Difference Between Ecoli and Klebsiella Structure Diseases and Identification
You must be knowing that we use bacteria to convert milk into curd. But do you know these bacteria also cause us various types of diseases? Some bacterias are useful for humans and some are harmful to human beings.
E.coli and Klebsiella are the bacteria that cause various types of diseases in human beings. Klebsiella is mostly responsible for causing pneumonia, and urinary tract infections. E.coli is responsible for causing various intestinal diseases, urinary tract infections, and neonatal meningitis.
What Is E.coli
E.coli is a rod-shaped, anaerobic bacteria that are commonly found in the intestine of animals. E.coli belongs to the genus Escherichia. It is a gram-negative bacteria. Normally e.coli does not cause harm to its host. But some e.coli can cause food poisoning. These bacteria are most commonly excreted through fecal matter in environments.
What Is Klebsiella
Klebsiella is a gram-negative bacteria that usually live in the intestine and does not harm the host. But it can go to other areas of the body and cause various infections and diseases. Such as if it reaches the lungs, then it can cause pneumonia. These bacteria are resistant to various disinfectants and antibiotics because of the presence of a capsule.
Characteristics Of The E.Coli And Culture Of E.Coli
Lysogeny or Luria is the most commonly used culture media for E.coli.
The characteristics of the culture of E.coli is given below:
The culture of E.coli is facultative aerobic which means it can make ATP in presence of oxygen if available, but can also do fermentation of oxygen if absent.
Maximum growth occurs at 37°c
They are commonly ord or bacilli shaped
It May occur singly or in pair
Protect intestine from bacterial infection
In the human gut, these bacteria also produce various vitamins such as vitamin k and vitamin B12
These bacteria also aid in digestion
There are more than 700 strains of E.coli
Characteristics Of The Klebsiella And Culture Of Klebsiella
The most commonly used culture media for Klebsiella are Macconkey agar or nutrient agar media.
The following are the characteristics of Klebsiella and the culture of Klebsiella
Klebsiella is a short and rod-shaped bacteria
Klebsiella on emb agar produces pink, large mucoid colonies
The size of these bacterias is 1-2 micrometer
These are non-motile and non-flagellated bacteria
These aerobic bacteria show the best growth in the presence of oxygen and can grow in absence of oxygen hence called facultative anaerobes.
Infections Caused By E.coli And Klebsiella
Following are the most common infections caused by E.coli
Cholecystitis - Inflammation of the gallbladder due to bacterial infection
Cholangitis - Inflammation of the bile duct system
Urinary tract infection
Neonatal meningitis
Pneumonia
Traveler's diarrhea
Following are the infections caused by Klebsiella
Pneumonia is the most common infection caused by Klebsiella
Urinary tract infection
Septicemia - infections caused by bacteria in the blood
Nosocomial infection - is also known as hospital-associated infection. These infections occur after admission to the hospital.
Infections of wound or surgical site.
Differences Between E.coli And Klebsiella
Important Questions
1. What antibiotics treat E.coli infections?
Ans: Fluoroquinolones are the antibiotics that are used to treat e.coli infections. These are broad-spectrum antibiotics that act on enzymes involved in DNA replication. Examples of fluoroquinolones are - Ciprofloxacin, levofloxacin, etc.
2. How dangerous is Klebsiella?
Ans: Klebsiella can cause pneumonia which can be serious if it gets into other parts of the body, especially when we have low immunity. And this can't be treated with common antibiotics.
3. How long does it take to treat Klebsiella?
Ans: Klebsiella can be treated with antibiotics in 14-21 days. These antibiotics may be given intravenously or orally.
Interesting Facts
Bacteria also communicate with each other by sending a signal
The number of bacterial cells present in a human is 10 times the cells of human cells.
Our body is protected by bacteria from invading pathogens
Bacteria adapt very fast to the environment
The smell of soil during rain is because of bacteria.
Key Features
In this article, we have studied E.coli and Klebsiella
These are the normal flora in humans and can be pathogenic in some cases such as in immunocompromised patients
There are differences between E.coli and Klebsiella
E.coli is beneficial for humans because it synthesises vitamins in the gut. It synthesizes vitamin K and vitamin B12 whereas Klebsiella is known for nitrogen fixation
E.coli is also known for causing various diseases such as pneumonia, urinary tract infections, etc. Whereas Klebsiella is known for causing various hospital-associated infections
Klebsiella infections include - pneumonia and other infections
Practice Questions
Is Klebsiella a common urinary tract bacteria?
What is the confirmatory test for E.coli?
How does Klebsiella cause urinary tract infection?
How does Klebsiella enter the body?
How long does it take to treat Klebsiella?
FAQs on Ecoli and Klebsiella Comparison in Microbiology
1. What are E. coli and Klebsiella?
E. coli and Klebsiella are Gram-negative, rod-shaped bacteria belonging to the family Enterobacteriaceae that commonly inhabit the human intestine.
- Escherichia coli (E. coli) is normally part of the gut microbiota but some strains are pathogenic.
- Klebsiella, especially Klebsiella pneumoniae, is an opportunistic pathogen found in the gut, respiratory tract, and environment.
- Both can cause infections when they enter sterile body sites such as the urinary tract, lungs, or bloodstream.
2. What diseases are caused by E. coli?
Pathogenic strains of E. coli cause gastrointestinal and extraintestinal infections.
- Diarrhea (e.g., ETEC, EHEC, EPEC strains)
- Urinary tract infections (UTIs) – most common cause worldwide
- Neonatal meningitis
- Septicemia (bloodstream infection)
3. What infections are caused by Klebsiella pneumoniae?
Klebsiella pneumoniae commonly causes hospital-acquired and community-acquired infections.
- Pneumonia, especially in hospitalized or immunocompromised patients
- Urinary tract infections
- Septicemia
- Liver abscess (particularly hypervirulent strains)
4. What is the difference between E. coli and Klebsiella?
The main difference between E. coli and Klebsiella is that E. coli is usually motile and part of normal gut flora, while Klebsiella is non-motile and strongly encapsulated.
- Motility: E. coli is motile (peritrichous flagella); Klebsiella is non-motile.
- Capsule: Klebsiella has a prominent polysaccharide capsule; E. coli capsule varies by strain.
- Lactose fermentation: Both ferment lactose on MacConkey agar.
- Clinical pattern: E. coli commonly causes UTIs and diarrhea; Klebsiella is strongly associated with pneumonia and hospital infections.
5. Are E. coli and Klebsiella Gram-positive or Gram-negative?
Both E. coli and Klebsiella are Gram-negative bacteria.
- They have a thin peptidoglycan layer and an outer membrane.
- The outer membrane contains lipopolysaccharide (LPS), which acts as an endotoxin.
- On Gram staining, they appear pink or red under a microscope.
6. How is E. coli transmitted?
E. coli is transmitted primarily through the fecal–oral route and contaminated food or water.
- Consumption of undercooked meat (especially ground beef)
- Contaminated vegetables or water
- Poor hand hygiene
- Person-to-person spread in close settings
7. Why is Klebsiella resistant to many antibiotics?
Klebsiella is resistant to many antibiotics due to the production of beta-lactamases and acquisition of resistance genes.
- Produces extended-spectrum beta-lactamases (ESBLs) that inactivate penicillins and cephalosporins.
- Some strains produce carbapenemases (e.g., KPC), causing carbapenem resistance.
- Resistance genes are often carried on plasmids, enabling rapid spread.
8. What is the role of E. coli in the human body?
Non-pathogenic E. coli plays a beneficial role as part of the normal gut microbiota.
- Helps synthesize vitamin K
- Competes with harmful bacteria, preventing colonization
- Assists in maintaining intestinal microbial balance
9. How are E. coli and Klebsiella identified in the laboratory?
E. coli and Klebsiella are identified using Gram staining, culture characteristics, and biochemical tests.
- Gram stain: Gram-negative rods
- MacConkey agar: Both are lactose fermenters (pink colonies)
- Motility test: E. coli is motile; Klebsiella is non-motile
- Indole test: E. coli is usually indole-positive; Klebsiella pneumoniae is indole-negative
10. Can E. coli and Klebsiella cause urinary tract infections?
Yes, both E. coli and Klebsiella can cause urinary tract infections (UTIs), but E. coli is the most common cause.
- E. coli accounts for the majority of community-acquired UTIs.
- Klebsiella is more common in hospital-acquired or catheter-associated UTIs.
- Infection occurs when bacteria ascend the urethra to the bladder.
