CPR or First Aid Class
in St. Louis?
Register Now!
Use Calendar Below
or Call Us.

Respiratory Diseases – Microbiology STLCC Lecture Online

Call Us Now

Get the Best CPR Class in St. Louis Today!

Diseases of the Respiratory System
Microbiology STLCC Lecture Online


I. Bacterial Disease Respiratory Tract

A. Streptococcal pharyngitis (Strep throat)

1. Steptococcus pyogenes (group A streptococci, GAS)

a. Also responsible for skin and soft tissue infections

1) Impetigo, acute bacterial endocarditis

b. GAS are resistant to phagocytosis

c. Produce streptokinases (dissolve clots which aids in spreading infection)

Call Us Now

Get the Best CPR Class in St. Louis Today!

d. Produce streptolysins (toxic to tissue cells, RBCs, and neutrophils)

2. Most cases of pharyngitis (sore throats) are not streptococcal infections


B. Otitis Media (Middle Ear Infection)

1. Staphylococcus pneumoniae most common (many bacteria)

2. Infection moves from throat through auditory tube to middle ear

C. Pneumonia

1. Streptococcus pneumoniae (typical pneumonia, pneumococcal pneumonia)

a. Capsule makes them resistant to phagocytosis

2. Affect bronchi and alveoli

3. High fever, chest pain

4. Many healthy people carry this bacterium

a. Becomes problematic with stress / lowered resistance


D. Tuberculosis (TB)

1. Mycobacterium tuberculosis

2. Ingested by alveolar macrophages; if not killed the bacteria reproduce in macrophages

3. Multiplying bacteria produce chemotactic response bringing other macrophages

4. Macrophages surround area and produce a tubercle (lump)

5. Tubercle can calcify and later break open and spread bacteria

6. Tuberculin skin test on arm

a. Purified protein from M. tuberculosis is injected subcutaneously

b. If area appears indurated (hardened) and red, it is positive for TB

7. Antibiotic treatment is long (6 months)

a. Antibiotics include ioniazid and rifampin

b. Multi-drug-resistant (MDR) strains are resistant to both


II. Viral Diseases of the Respiratory Tract

A. Common Cold

1. Caused by over 200 viruses

2. Rhinovirus most common

3. Sneezing, nasal secretions, congestion

4. Moves from throat to sinuses, to lower respiratory system

5. Spread via virus in mucus


B. Influenza (Flu)

1. Influenzavirus

a. A, B, and C types

b. Type A is most prominent

2. Mode of Transmission

a. Inhalation of viral laden droplets and fomites

b. Virus can survive 24 on non-living surfaces

3. Infection and Disease

a. Virus binds to cells of respiratory mucosa

b. Rapidly destroys these cells and releases a load of viruses

4. Secondary Infections

a. Pneumonia – Streptococcus pneumoniae and Staphyloccus aureus


5. Signs and Symptoms

a. Chills, fever, headache, myalgia (muscle aches)


Flu Vs. Cold


Related Posts

× Yes, we are your local American Heart Association training site. We offer in-person classes, skills checks, and blended online learning.

*IMPORTANT NOTE: 100% of CPR St. Louis instructors have entirely completed (1) the rigorous and official American Heart Association instructor training and certification process, and (2) the “How to Teach a Stress-Free CPR Class™” classroom and testing training protocol that ensures a superior experience for everyone. In addition, students will receive their AHA Cards the day of class!

[WARNING]: Because of the high quality, stress-free classroom student experience, our classes fill very fast - so register now to ensure your spot. See our course calendar for online registration or contact us directly by phone, live chat or email with questions.