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Questions and Answers

Which type of microorganism exclusively requires the absence of oxygen for growth?

  • Aerotolerant organisms
  • Facultative anaerobes
  • Obligate anaerobes (correct)
  • Microaerophiles

Which medium would best support the growth of Corynebacterium diphtheria?

  • Lowenstein-Jensen Medium
  • Bordet-Gengou Medium
  • Loeffler’s Serum Medium, Tellurite (correct)
  • Thiosulfate citrate bile salts medium

What type of hemolysis is characterized by green coloration on blood agar?

  • Non-hemolytic
  • γ-hemolytic
  • α-hemolytic (correct)
  • β-hemolytic

Which medium is primarily used for the cultivation of Enterobacteriaceae?

<p>MacConkey agar (B)</p> Signup and view all the answers

Which of the following is a characteristic of microaerophiles?

<p>Grow optimally in reduced oxygen levels (A)</p> Signup and view all the answers

Which of these bacteria is known to be an obligate anaerobe?

<p>Clostridium (D)</p> Signup and view all the answers

What is the typical appearance of lactose fermenters on MacConkey agar?

<p>Pink colonies (C)</p> Signup and view all the answers

Which of the following genera is classified as a microaerophile?

<p>Helicobacter (B)</p> Signup and view all the answers

What is primarily associated with Chlamydia pneumoniae?

<p>Atypical pneumonia (D)</p> Signup and view all the answers

What is a common presenting feature of congenital syphilis?

<p>Hutchinson’s triad (D)</p> Signup and view all the answers

Which organism is associated with parrot fever and presents as psittacosis?

<p>Chlamydia psittaci (C)</p> Signup and view all the answers

What is a major risk factor associated with Chlamydia pneumoniae according to recent studies?

<p>Atherosclerosis (B)</p> Signup and view all the answers

Which of the following is a treatment option for Chlamydia psittaci infections?

<p>Macrolides (A)</p> Signup and view all the answers

What is an important transmission method for Legionella pneumophila?

<p>Droplet transmission (B)</p> Signup and view all the answers

Which of the following is a systemic manifestation seen in tertiary syphilis?

<p>Gumma formation (D)</p> Signup and view all the answers

What is the primary cause of flaccid paralysis in infants due to botulism?

<p>Ingestion of spores from infected honey (D)</p> Signup and view all the answers

What is a potential outcome of leptospirosis infection?

<p>Silent infection (C)</p> Signup and view all the answers

Which of the following preventative measures is recommended to avoid botulism?

<p>Heating canned goods at 100°C for 20 minutes (C)</p> Signup and view all the answers

Which organism is noted for its ability to form spores and cause botulism?

<p>Clostridium botulinum (C)</p> Signup and view all the answers

In adults, botulism can lead to respiratory muscle paralysis. What is the primary symptom that is commonly observed?

<p>Flaccid paralysis and difficulty breathing (A)</p> Signup and view all the answers

Which of the following statements about Bacillus is true?

<p>Bacillus cereus can cause food poisoning. (B)</p> Signup and view all the answers

What primary function does the cell membrane serve for bacteria?

<p>Acts as a selective barrier for solutes and energy metabolism (C)</p> Signup and view all the answers

Which locomotion organelle is not found in atrichous bacteria?

<p>Flagella (D)</p> Signup and view all the answers

During which phase of microbial growth does the rate of replication equal the rate of death?

<p>Stationary Phase (C)</p> Signup and view all the answers

What is the role of fimbriae in bacterial cells?

<p>Attachment to host cells (C)</p> Signup and view all the answers

Which of the following represents a reason for microbial death?

<p>Accumulation of toxins (B)</p> Signup and view all the answers

What type of bacterial flagellation is characterized by one flagellum at one end?

<p>Monotrichous (A)</p> Signup and view all the answers

Which of the following statements about the log phase of microbial growth is false?

<p>Cell size decreases significantly. (B)</p> Signup and view all the answers

Which structure in bacteria is responsible for DNA storage?

<p>Nucleoid (D)</p> Signup and view all the answers

What condition is associated with widespread thrombosis and may lead to bleeding?

<p>Waterhouse-Friedrichsen syndrome (B)</p> Signup and view all the answers

Which treatment options are effective for Listeria infections?

<p>Penicillin and Chloramphenicol (B), Ampicillin and Gentamicin (D)</p> Signup and view all the answers

What is the primary virulence factor of Haemophilus influenzae?

<p>Capsule type b (A)</p> Signup and view all the answers

Which symptom is associated with early onset human listeriosis?

<p>Stillbirth (A), Granulomatosis infantseptica (B)</p> Signup and view all the answers

Which organism is classified as Gram-negative cocobacilli?

<p>Brucella (C)</p> Signup and view all the answers

What is the most common cause of meningitis in neonates?

<p>Group B Streptococcus (C)</p> Signup and view all the answers

In which conditions does Haemophilus influenzae require special nutrient requirements?

<p>Growth in chocolate agar plates (D)</p> Signup and view all the answers

Which of the following is a common presentation of community-acquired pneumonia from Haemophilus influenzae?

<p>Bacteremia (A)</p> Signup and view all the answers

What type of pathogens can survive in low pH and refrigerator temperatures?

<p>Listeria monocytogenes (D)</p> Signup and view all the answers

Which of the following statements is true about Salmonella and Proteus?

<p>Both are H2S producing. (C)</p> Signup and view all the answers

What condition is primarily associated with transplacental transmission?

<p>Chaga’s disease (D)</p> Signup and view all the answers

What is a common acute symptom of Chaga's disease?

<p>Chills (A)</p> Signup and view all the answers

Which of the following organisms is responsible for mucocutaneous leishmaniasis?

<p>L.braziliensis (A)</p> Signup and view all the answers

Which treatment is considered the drug of choice for managing congenital infections in Chaga’s disease?

<p>Pyrimethamine + Sulfadiazine (A)</p> Signup and view all the answers

What is a significant chronic manifestation of Chaga's disease?

<p>Myocarditis (C)</p> Signup and view all the answers

Which diagnostic method is utilized in the early acute stage of Chaga's disease?

<p>Thick and thin blood films (D)</p> Signup and view all the answers

Which of the following is NOT a form of leishmaniasis mentioned?

<p>Intestinal leishmaniasis (B)</p> Signup and view all the answers

What complication is associated with Brazilian Chaga's disease?

<p>Megaesophagus (B)</p> Signup and view all the answers

Flashcards

Bacillus

A genus of rod-shaped bacteria.

Clostridium

A genus of rod-shaped bacteria often forming endospores.

Cell Membrane

A phospholipid bilayer in bacteria, controlling what enters and leaves the cell; also needed for energy production.

Attachment Proteins (Fimbriae)

Bacterial structures used for attaching to host cells.

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Attachment Proteins (Pili)

Bacterial structures used for attachment and conjugation with other bacteria.

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Axial Filament

Structures that allow corkscrew-like movement in spirochetes.

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Flagella

Whip-like structures used for bacterial locomotion.

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Lag Phase

The initial stage of bacterial growth characterized by no replication but increased cell size.

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Log Phase

The phase of rapid exponential bacterial growth.

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Stationary Phase

The stage when the number of bacteria dying equals the number multiplying.

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Death Phase

The final stage of bacterial growth when deaths exceed reproductions.

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Nucleoid

The region in a bacterial cell containing its DNA.

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Plasmid

Extrachromosomal DNA in bacteria.

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Endospores

Durable structures formed by some bacteria, enabling survival in harsh conditions.

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Obligate Anaerobes

Microorganisms that require the absence of oxygen to grow.

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Microaerophiles

Organisms needing low oxygen levels but are harmed by high-oxygen concentrations.

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Aerotolerant

Organisms that tolerate oxygen but don't use it for growth.

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Differential Medium

A growth medium that distinguishes between different types of bacteria based on their metabolic characteristics (e.g. color reactions).

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Lowenstein-Jensen Medium

A medium used specifically for cultivating Mycobacterium species and is commonly used for Mycobacterium tuberculosis.

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Loeffler’s Serum Medium

A medium used for cultivating Corynebacterium species

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Campy BAP

A medium used for cultivating Campylobacter jejuni.

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Bordet-Gengou Medium

A medium used for cultivating Bordetella pertussis

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TCBS Agar

A medium for Vibrio spp., utilizing sucrose.

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MacConkey Agar

Used for differentiating enterobacteria by their lactose fermentation.

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Eosin Methylene Blue Agar

Used to distinguish various enterobacteria by lactose fermentation.

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α-hemolysis

Partial hemolysis, producing green zones on blood agar.

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β-hemolysis

Complete hemolysis, producing clear zones.

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γ-hemolysis

Non-hemolysis, producing a red zone.

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Sporeforming Gram-Positive Bacilli

Bacteria that produce tough structures called spores, are rod-shaped, and stain gram-positive.

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Bacillus

A genus of sporeforming, gram-positive bacteria, often aerobic.

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Clostridium

A genus of sporeforming, gram-positive bacteria, often anaerobic.

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Bacillus anthracis

A species of Bacillus, causing anthrax, an often-fatal disease.

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Bacillus cereus

A species of Bacillus, linked to food poisoning.

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Infant botulism

A type of botulism caused by ingesting spores, common in infants.

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Adult botulism

A type of botulism caused by ingesting toxins from infected canned foods.

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Listeria monocytogenes

A foodborne pathogen that can survive in refrigerators and low pH environments, causing serious illness in humans, particularly pregnant women and newborns.

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Chlamydia pneumoniae

A bacterium, formerly known as the TWAR agent, linked to atypical pneumonia and a risk factor for atherosclerosis.

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Meningococcemia

A severe condition caused by Neisseria meningitidis characterized by widespread blood clots leading to organ damage and shock.

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Chlamydia psittaci

A bacterium causing psittacosis (parrot fever) or ornithosis (other birds) transmitted via dried bird excrement inhalation.

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Latent Syphilis

A stage of syphilis lasting about 10 years, often asymptomatic.

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Waterhouse-Friedrichsen syndrome

A life-threatening complication of some bacterial infections characterized by hemorrhaging into the adrenal glands.

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Haemophilus influenzae

A Gram-negative bacillus commonly causing meningitis, especially in infants and children.

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Tertiary Syphilis

A rare, late manifestation of syphilis, involving gummas, neurosyphilis, and aortic aneurysm.

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Congenital Syphilis

Syphilis acquired during pregnancy's first trimester, potentially causing intrauterine death or congenital abnormalities like Hutchinson's triad.

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Hib vaccine

A vaccine that protects against the most dangerous type of Haemophilus influenzae infection.

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Community Acquired Pneumonia (CAP)

Pneumonia caused acquired outside of a healthcare setting; commonly treated with cephalosporins or macrolides.

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Legionella pneumophila

A bacterium causing Legionnaires' disease, often transmitted through air-conditioning water systems.

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Pallidum

A bacterium affecting nervous system; linked to syphilis.

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3rd generation cephalosporins

Broad-spectrum antibiotics effective against various Gram-negative bacteria, frequently used to treat bacterial infections.

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Neutropenia

A low count of neutrophils in the blood.

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Enterobacteriaceae

A large family of facultative anaerobic, Gram-negative bacilli.

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Hypotension

Low blood pressure.

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Chagas Disease Definitive Host

The definitive host for Chagas disease is an insect, specifically the Triatoma species.

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Chagas Disease Presentation

Chagas disease can present acutely as asymptomatic or with symptoms like fever, headache, and fatigue. Progression to chronic disease often involves cardiomyopathy and arrhythmias.

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Chagas Disease Diagnosis

Diagnosis involves blood tests, like thick & thin blood smears for parasites, or serologic tests for antibodies.

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Chagas Disease Treatment

Nifurtimox and Benznidazole are common treatments for Chagas disease in its acute or chronic stages.

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Leishmaniasis Types

Leishmaniasis includes cutaneous, mucocutaneous, and visceral forms, caused by different Leishmania species.

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Leishmaniasis Diagnosis

Leishmaniasis diagnosis mainly uses serologic tests to detect antibodies.

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Leishmaniasis Treatment

Treatment options for leishmaniasis include combinations of Pyrimethamine & Sulfadiazine or Pyrimethamine & Clindamycin.

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Babesia microti

A protozoan that can cause a potentially serious blood infection.

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Related Documents

Microbiology Module 6 PDF

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