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Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli
Bauman - Microbiology with Diseases by Taxonomy 6th Edition
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Bauman 6th EditionCh. 20 - Pathogenic Gram-Negative Cocci and Bacilli문제 7
20장, 문제 7

Which of the following bacteria might be responsible for the formation of petechiae in a host?
a. Neisseria meningitidis
b. Escherichia coli O157:H7
c. Klebsiella
d. Proteus mirabilis

검증된 단계별 안내
1
Understand what petechiae are: small red or purple spots on the skin caused by minor bleeding from broken capillary blood vessels.
Recall which bacteria are known to cause diseases associated with petechiae. Petechiae often result from infections that affect blood vessels or cause septicemia.
Review the characteristics of each bacterium listed: Neisseria meningitidis is known for causing meningitis and meningococcemia, which can lead to petechiae due to vascular damage.
Escherichia coli O157:H7 is primarily associated with gastrointestinal illness and hemolytic uremic syndrome, but not typically petechiae formation.
Klebsiella and Proteus mirabilis are usually linked to urinary tract infections and other localized infections, not commonly causing petechiae.

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주요 개념

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Petechiae and Their Clinical Significance

Petechiae are small, red or purple spots on the skin caused by minor bleeding from broken capillary blood vessels. They often indicate vascular damage or platelet abnormalities and can be a sign of serious infections or systemic diseases.
추천 영상:
03:59
Archaeal Cell Membranes

Neisseria meningitidis Pathogenesis

Neisseria meningitidis is a gram-negative bacterium known for causing meningitis and septicemia. It can invade the bloodstream, damaging blood vessels and leading to petechiae due to endotoxin-induced vascular injury and disseminated intravascular coagulation.
추천 영상:
02:35
Intro to Bacterial Pathogenesis

Differentiation of Bacterial Pathogens by Clinical Manifestations

Different bacteria cause distinct clinical symptoms based on their virulence factors and infection sites. Understanding which bacteria cause vascular damage and petechiae helps differentiate pathogens like Neisseria meningitidis from others such as E. coli O157:H7, Klebsiella, or Proteus mirabilis.
추천 영상:
04:07
Differential Staining
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Given that pseudomonads are present in almost every moist environment, why do they cause less disease than other, less prevalent Gram-negative bacteria?

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A coliform bacterium that likely contaminates dairy products is ___________.

a. Bartonella

b. Serratia

c. Enterobacter

d. Proteus

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Capsules of pathogenic enteric bacteria are virulence factors because they __________.

a. Capture iron from hemoglobin and store it in the bacteria

b. Release hemolysins that destroy red blood cells

c. Produce fimbriae that enable the bacteria to attach to human cells

d. Protect the bacteria from phagocytosis and from some antibodies

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The pathogen Haemophilus influenzae b causes.

a. Meningitis in children

b. Upper respiratory flu

c. Endocarditis

d. Genital chancroid

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