MICROBIOLOGY Chapter 14 & 15

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Gram-negative septic shock results from the following events. What is the second step?

LPS is released from gram-negative bacteria

Figure 14.1 shows the incidence of influenza during a typical year. Which letter on the graph indicates the endemic level?

d

Which of the following is NOT a membrane-disrupting toxin?

A-B toxin

Patients developed inflammation a few hours following eye surgery. Instruments and solutions were sterile, and the Limulus assay was positive. The patients' inflammation was due to

Endotoxin.

Injectable drugs are tested for endotoxins by

The Limulus amoebocyte lysate test.

Symptoms of protozoan and helminthic diseases are due to

all of the above

Which of these infections can cause septicemia?

Focal infection

Which of the following is NOT a method of avoiding host antibodies?

Membrane-disrupting toxins

Which of the following can contribute to postoperative infections?

all of the above

Bacteria that cause periodontal disease have adhesins for receptors on streptococci that colonize on teeth. This indicates that

Streptococcal colonization is necessary for periodontal disease

Pseudomonas bacteria colonized the bile duct of a patient following his liver transplant surgery. This is an example of a

Nosocomial infection

One effect of washing regularly with antibacterial agents is the removal of normal microbiota. This can result in

increased susceptibility to disease

Situation 14.1
During a 6-month period, 239 cases of pneumonia occurred in a town of 300 people. A clinical case was defined as fever ≥39°C lasting >2 days with three or more symptoms (i.e., chills, sweats, severe headache, cough, aching muscles/joints, fatigue, or feeling ill). A laboratory-confirmed case was defined as a positive result for antibodies against Coxiella burnetii. Before the outbreak, 2000 sheep were kept northwest of the town. Of the 20 sheep tested from the flock, 15 were positive for C. burnetii antibodies. Wind blew from the northwest, and rainfall was 0.5 cm compared with 7 to 10 cm during each of the previous 3 years.


Situation 14.1 is an example of

a zoonosis

Antibiotics can lead to septic shock if used to treat

Gram-negative bacterial infections

Most pathogens that gain access through the skin

Enter through hair follicles and sweat ducts.

A nosocomial infection is

Acquired during the course of hospitalization.

A needlestick is an example of which portal of entry?

parenteral route

Mechanical transmission differs from biological transmission in that mechanical transmission

doesn't involve specific diseases

Which of the following is a fomite?

a hypodermic needle

Which of the following organisms causes the most severe disease?

Can't tell

Which of the following does NOT contribute to a pathogen's invasiveness?

Toxins

The most likely mode of transmission of pneumonic plague between humans is

Droplet transmission

Endotoxins are

Part of the gram-negative cell wall.

Koch's postulates don't apply to all diseases because

Not all diseases are caused by microorganisms.

Symptoms of disease differ from signs of disease in that symptoms

Are changes felt by the patient.

Septic shock due to gram-positive bacteria is caused by

superantigens

Pseudomonas aeruginosa produces a two-part exotoxin. The most likely pathologic effect of this toxin is

Inhibition of protein synthesis

Influenza transmitted by an unprotected sneeze is an example of

Droplet transmission

A cell wall can increase a bacterium's virulence because cell wall lipid A

is toxic

Botulism is caused by a proteinaceous exotoxin; therefore it can easily be prevented by

Boiling food prior to consumption.

A commensal bacterium

may be an opportunisitic pathogen

Which of the following CANNOT be used for adherence?

cell membrane mannose

Poliovirus is ingested and gains access to tissues by which portal of entry?

Mucous membrane

Koch observed Bacillus anthracis multiplying in the blood of cattle. What is this condition called?

septicemia

The science that deals with when diseases occur and how they are transmitted is called

Epidemiology

Emergence of infectious diseases can be due to all of the following EXCEPT

Microbes trying to cause disease

The major significance of Koch's work was that

Microorganisms cause disease

Which organism most easily causes an infection?

Legionella pneumophila ID50=1

Transient microbiota differ from normal microbiota because transient microbiota

Are present for a relatively short time

Thirty-two people in San Francisco who ate jackfish caught at Midway Island developed malaise, nausea, blurred vision, breathing difficulty, and numbness from 3 to 6 hours after eating. The most likely cause of this food intoxication is

Ciguatera.

A needlestick is an example of

fomite

Which of the following diseases is NOT spread by droplet infection?

Botulism

The most frequently used portal of entry for pathogens is the

Mucous membrane of the respiratory tract

A sexually transmitted disease is an example of

Direct contact

Which of the following cytopathic effects is cytocidal?

Release of enzymes from lysosomes

Gastroenteritis acquired from roast beef is an example of

Vehicle transmission

Which of the following does NOT contribute to the virulence of a pathogen?

All of the above contribute to a pathogen's virulence

Cholera toxin polypeptide A binds to surface gangliosides on target cells. If the gangliosides were removed,

Polypeptide B would not be able to enter the cells

Plague transmitted by a flea is an example of

vector

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