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Questions and Answers
What type of media can support the growth of the colonies discussed?
What type of media can support the growth of the colonies discussed?
- Lactose MacConkey agar.
- Nutrient agar with antibiotics.
- Blood agar. (correct)
- Mannitol salt agar.
What characteristic is associated with the colonies mentioned in the content?
What characteristic is associated with the colonies mentioned in the content?
- Colony morphology is transparent.
- Colony color is gray. (correct)
- Colony color is bright yellow.
- Colony growth requires specialized media.
What is a significant feature of the organism mentioned in the content?
What is a significant feature of the organism mentioned in the content?
- It is primarily aerobic.
- It requires high temperatures for growth.
- It forms a capsule. (correct)
- It is non-pathogenic and harmless.
What does the term 'pathogenic' imply about the organism?
What does the term 'pathogenic' imply about the organism?
What can be inferred about the organism if it can grow on ordinary media?
What can be inferred about the organism if it can grow on ordinary media?
What color do lactose fermenting colonies appear on Desoxycholate citrate agar?
What color do lactose fermenting colonies appear on Desoxycholate citrate agar?
What type of colonies does Desoxycholate citrate agar not favor?
What type of colonies does Desoxycholate citrate agar not favor?
Which of the following accurately describes lactose fermenting colonies?
Which of the following accurately describes lactose fermenting colonies?
What would you expect from pale non-lactose fermenting colonies on Desoxycholate citrate agar?
What would you expect from pale non-lactose fermenting colonies on Desoxycholate citrate agar?
What type of fermenter results in a lack of color change on Desoxycholate citrate agar?
What type of fermenter results in a lack of color change on Desoxycholate citrate agar?
What type of infection is characterized only by serological markers without clinical signs?
What type of infection is characterized only by serological markers without clinical signs?
Which type of infection does NOT exhibit obvious clinical symptoms?
Which type of infection does NOT exhibit obvious clinical symptoms?
Which of the following best describes latent infection?
Which of the following best describes latent infection?
In what type of infection is the pathogen not actively replicating in the host?
In what type of infection is the pathogen not actively replicating in the host?
Which characteristic is NOT associated with latent infections?
Which characteristic is NOT associated with latent infections?
What type of products is primarily associated with Brucellosis infection?
What type of products is primarily associated with Brucellosis infection?
Which antibiotic is mentioned as a primary treatment for Brucellosis?
Which antibiotic is mentioned as a primary treatment for Brucellosis?
What is the morphology of Brucellae bacteria?
What is the morphology of Brucellae bacteria?
Which symptom is least associated with Brucellosis?
Which symptom is least associated with Brucellosis?
What is the size range of Brucellae bacteria?
What is the size range of Brucellae bacteria?
What is the typical time frame for patients to become afebrile after therapeutic intervention?
What is the typical time frame for patients to become afebrile after therapeutic intervention?
Which statement is true regarding the therapeutic response?
Which statement is true regarding the therapeutic response?
What should one expect regarding fever resolution after treatment?
What should one expect regarding fever resolution after treatment?
How quickly should healthcare providers expect the therapeutic effects to manifest?
How quickly should healthcare providers expect the therapeutic effects to manifest?
Which of the following is NOT a characteristic of the therapeutic response timeframe?
Which of the following is NOT a characteristic of the therapeutic response timeframe?
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Study Notes
Pathogenic Characteristics
- Includes capsulated bacteria, specifically the genus Brucella, which are non-motile and rod-shaped.
- Colonies appear gray and can grow on common media such as blood agar.
- Characters of lactose fermentation: Some colonies ferment lactose, resulting in a pinkish color, while non-lactose fermenters yield pale colonies on desoxycholate citrate agar.
Infectious Process
- Brucella can cause brucellosis, primarily through exposure to unpasteurized dairy products, particularly milk.
- Infections may be asymptomatic or present as latent with serological evidence but no apparent symptoms.
Clinical Manifestations
- Clinical presentation includes undulant fever, which is characterized by fluctuating body temperature.
- Symptoms may encompass exhaustion, muscle and joint pain, commonly affecting cows and pigs.
Treatment
- Primary treatment options include doxycycline and rifampin.
- Therapeutic responses may be slow; it can take 2 to 7 days for patients to become fever-free after starting treatment.
Morphology and Structure
- Brucellae are small coccobacillary bacilli measuring between 0.5 to 0.7 μm in diameter and 0.6 to 1.5 μm in length.
- Their pathogenic nature is linked to their capsule formed by polysaccharides, which contributes to evading the host immune response.
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