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Chapter 19: Problem 6

The pus-producing skin infection (pyoderma) can be caused by: (a) Staphylococci (b) Streptococci (c) Corynebacteria (d) A combination of staphylococci, streptococci, and corynebacteria (e) All of these

Short Answer

Expert verified
The correct answer is (e) All of these.

Step by step solution

01

Understanding the Exercise

The question asks which organisms can cause a pus-producing skin infection, known as pyoderma. We are given several options and need to determine which of them are accurate causes.
02

Identifying the Causes of Pyoderma

Pyoderma can be caused by bacteria such as Staphylococci and Streptococci. These bacteria are commonly known to cause various skin infections, including pyoderma.
03

Assessing the Role of Corynebacteria

Corynebacteria are less commonly associated with pyoderma compared to Staphylococci and Streptococci but can also be involved, especially in combination with other bacteria.
04

Evaluating the Correct Option

Based on the information from the previous steps, both (a) Staphylococci and (b) Streptococci can individually cause pyoderma, while (c) Corynebacteria can cause it in combination with other bacteria. Therefore, option (d) and (e) also seem plausible.
05

Concluding the Correct Answer

Since all given organisms can potentially cause pyoderma, either individually or in combination, the correct answer is (e) All of these.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Pyoderma
Pyoderma is a general term for any skin disease that is characterized by the presence of pus. This common condition is often an indicator that the body is fighting off an infection. The infected area typically appears red and swollen, and it may be painful to the touch. Pyoderma can affect people of all ages, although children and those with weakened immune systems might be more susceptible.
Some common symptoms include:
  • Red, inflamed lesions on the skin
  • Pus-filled blisters
  • Itching and discomfort
  • Crusty sores that can extend beyond the initial area
Understanding the direct cause is essential for effective treatment, which is usually centered on the identification of the bacterial culprit and subsequent appropriate antibiotic therapy.
The Role of Staphylococci
Staphylococci, often referred to as "staph," are a group of bacteria that commonly inhabit the skin and nose of people. While they can live harmlessly, certain strains like Staphylococcus aureus can lead to infections. These bacteria cause a variety of skin infections, including boils, impetigo, and cellulitis, which are forms of pyoderma.
Staphylococci are notorious for:
  • Producing enzymes that protect them from the immune system
  • Developing resistance to certain antibiotics
  • Spreading easily through skin contact
They are one of the primary bacterial culprits behind pyoderma, particularly in hospital settings where the strains may be more resilient. Proper hygiene is key to preventing their spread.
Exploring Streptococci Infections
Streptococci are another group of bacteria that can cause pyoderma. Unlike Staphylococci, they are often associated with throat infections such as strep throat. However, they can also infect skin wounds and lead to conditions like impetigo, which is a common form of pyoderma in children. These bacteria often behave differently than Staphylococci but can equally be severe if left untreated.
Key characteristics of Streptococci include:
  • Ability to cause infections rapidly
  • Some strains produce toxins that contribute to symptom severity
  • Often require antibiotic treatment to clear infections
Recognizing infections caused by Streptococci early is crucial for minimizing complications and preventing outbreaks in group settings such as schools.
Understanding Corynebacteria's Contribution
Corynebacteria are less commonly known compared to Staphylococci and Streptococci but still play a role in pyoderma, particularly when combined with other bacteria. These bacteria are typically harmless and part of our normal skin flora. However, in certain conditions, they can become pathogenic.
Important aspects of Corynebacteria include:
  • Being part of normal skin and mucous membrane flora
  • Potential to cause infections in immunocompromised individuals
  • Involvement in mixed infections with other bacteria
While they are not the primary cause of pyoderma, their presence can complicate an infection and require specific antibiotic strategies. Monitoring their role in infections is vital, especially in environments like hospitals.

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