14 Questions
Which Gram-negative bacteria is commonly known as the 'Blood-lover'?
Haemophilus influenzae
What is the most common type of Haemophilus influenzae?
Type B
What type of infections can nontypeable Haemophilus influenzae cause?
Localized infections
Which bacteria is referred to as Pfeiffer’s Bacillus and can cause bacterial meningitis?
Haemophilus influenzae
What are the classic symptoms associated with inflammation of the epiglottis caused by Haemophilus influenzae?
Dysphoria, dysphagia, distress, drooling
Which factor required for growth by Haemophilus influenzae is heat-labile?
V factor (coenzyme I, NAD)
Which agar is best for cultivation of Haemophilus influenzae?
Horse blood-bacitracin agar
What is the characteristic appearance of Haemophilus ducreyi when viewed under the microscope?
Pleomorphic rods
Which bacteria can cause purulent conjunctivitis and is commonly known as Koch Week’s Bacillus?
Haemophilus aegyptius
Which bacterium is responsible for Brazilian purpuric fever, a disease characterized by high fever and fatal sepsis?
Haemophilus aegyptius
What is the characteristic appearance of Haemophilus ducreyi when viewed under the microscope?
Pleomorphic rods
What factor is not required for the growth of Bordetella bacteria?
Coenzyme I (V factor)
Which bacteria can cause sexually transmitted disease characterized by the appearance of single or multiple lesions that develop into sharply circumscribed, nonindurated, painful ulcers in the genitalia and perianal areas?
Haemophilus ducreyi
Which bacteria is part of the normal flora of the mouth and nasopharynx and can cause endocarditis?
Haemophilus parainfluenzae
Study Notes
Haemophilus influenzae
- Haemophilus influenzae is commonly known as the 'Blood-lover' and Pfeiffer's Bacillus.
- The most common type of Haemophilus influenzae is nontypeable.
- Nontypeable Haemophilus influenzae can cause otitis media, conjunctivitis, and exacerbations of chronic obstructive pulmonary disease (COPD).
Infections and Symptoms
- Haemophilus influenzae can cause bacterial meningitis, which can lead to inflammation of the epiglottis, characterized by symptoms such as fever, sore throat, and difficulty swallowing.
- The growth of Haemophilus influenzae requires a heat-labile factor, NAD (nicotinamide adenine dinucleotide).
Cultivation and Identification
- Haemophilus influenzae can be cultivated on Levinthal or Fildes agar.
- Haemophilus ducreyi, when viewed under the microscope, appears as a "school of fish" or "railroad track" arrangement.
Other Haemophilus species
- Haemophilus ducreyi is commonly known as Koch Week's Bacillus and can cause purulent conjunctivitis.
- Haemophilus aegyptius is responsible for Brazilian purpuric fever, characterized by high fever and fatal sepsis.
Bordetella
- Bordetella bacteria do not require NAD for growth.
Sexually Transmitted Infections
- Haemophilus ducreyi can cause a sexually transmitted disease characterized by the appearance of single or multiple lesions that develop into sharply circumscribed, nonindurated, painful ulcers in the genitalia and perianal areas.
Normal Flora
- Haemophilus species are part of the normal flora of the mouth and nasopharynx and can cause endocarditis.
Test your knowledge of small gram-negative bacteria including Haemophilus, Bordetella, Pasteurella, Actinobacillus, and other related bacteria. This quiz covers growth factors, characteristics, and identification of these microorganisms.
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