Exam 18: Haemophilus, Hacek, Legionella, and Other Fastidious Gram-Negative Bacilli

All the following organisms are associated with human illness, except

What organisms often are involved in septicemia in the granulocytopenic patient?

A microbiologist is reading the plates from a sputum culture. There is growth only on the chocolate plate. When the microbiologist takes off the lid of the culture plate, he notices a distinct "mousy" smell. What organism can this be?

Which one of the virulence factors associated with Haemophilus spp. plays the most significant role in the invasiveness of the organism?

A microbiologist is reading plates from a CSF culture. She notices that there is growth on CHOC, but no growth on SBA or MAC agar. The Gram stain showed a gram-negative bacillus. What organism should be suspected?

What organism causes Brazilian purpuric fever (BPF)?

What organism produces a community-acquired pneumonia, with symptoms different than a Streptococcus pneumoniae infection, leading to the designation of atypical pneumonia?

What medium will sustain the growth of most Haemophilus spp.?

Which species are associated with infections in humans?

A microbiologist is reading a sputum culture and notices tiny, translucent colonies growing closely around a $\beta$ hemolytic colony on sheep blood agar (SBA). The colonies are growing in the area where the blood has been hemolyzed. What is the probable identity of the organism that is growing closely to the $\beta$ -hemolytic organism, and why are they growing in the hemolyzed area?

What is the most frequently isolated Pasteurella species?

What organism is likely to cause an infection after a cat bite?

What agar is used to isolate Bordetella pertussis?

A mother brings her lethargic, feverish baby into the emergency department. The baby is diagnosed with meningitis, and the physician does a spinal tap. The cerebrospinal fluid (CSF) Gram stain shows many tiny gram-negative rods. What is the most probable identification of this organism?

What is the drug of choice for treating Bordetella pertussis infection?

This organism is described as glistening, silver, and resembling a mercury droplet on media supplemented with horse blood.

What is the drug of choice for treating a Legionella infection?

This bacterium is the causative agent of kennel cough in dogs and is occasionally associated with respiratory tract infections in humans.

What are the names of the two diseases caused by Legionella species?

What is the drug of choice for treating a life-threatening illness caused by H. influenzae?