Bacteriology 02: Small Gram-Negative Bacteria Lecture Quiz

Which Gram-negative bacteria is commonly known as the 'Blood-lover'?

What is the most common type of Haemophilus influenzae?

What type of infections can nontypeable Haemophilus influenzae cause?

Which bacteria is referred to as Pfeiffer’s Bacillus and can cause bacterial meningitis?

What are the classic symptoms associated with inflammation of the epiglottis caused by Haemophilus influenzae?

Which factor required for growth by Haemophilus influenzae is heat-labile?

Which agar is best for cultivation of Haemophilus influenzae?

What is the characteristic appearance of Haemophilus ducreyi when viewed under the microscope?

Which bacteria can cause purulent conjunctivitis and is commonly known as Koch Week’s Bacillus?

Which bacterium is responsible for Brazilian purpuric fever, a disease characterized by high fever and fatal sepsis?

What is the characteristic appearance of Haemophilus ducreyi when viewed under the microscope?

What factor is not required for the growth of Bordetella bacteria?

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?

Which bacteria is part of the normal flora of the mouth and nasopharynx and can cause endocarditis?

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.