Microbiology Final Exams 1-4 – Flashcards

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question
Incidence is a better measure than prevalence for judging whether an outbreak is coming to an end.
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True
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Under certain circumstances a person's normal flora can cause disease.
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True
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All species in the genus Staphylococcus are coagulase-positive.
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False
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With respect to zoonoses, the reservoir and vector are always the same.
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False
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Some bacteria have enzymes that hydrolyze secretory IgA. these enzymes are virulence factors.
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True
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A temporary increase in the number of cases of a disease is called an outbreak.
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True
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A disease can have an infectious cause yet be non-communicable.
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True
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Streptococcus pyogenes is a Group A B-hemolytic strep.
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True
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Human herpesviruses establish life-long infections in people.
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True
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Because of respiratory droplet transmission, nursing home outbreaks of shingles are quite common.
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False
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People with immune deficiencies are more likely than normal people to have opportunistic infections.
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True
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The measles virus causes permanent, lifelong infections.
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False
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Infectious dose measures the number of cells or virus particles required to produce and infection
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True
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Fomites are small insects that transmit bacterial and viral pathogens
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false
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Some viruses can cause cancer
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True
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If a pathogen is described as "opportunistic"
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it will not cause disease in most healthy people.
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Adhesins are
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structures on pathogens that help them adhere to body surfaces.
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Which of these diseases are Not due to a bacterial toxin tetanus scalded skin syndrome
toxic shock syndrome
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yeast infection
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When people disinfect benches and lockers in locker rooms, they are trying to prevent _____ transmission of MRSA.
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fromite
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This opportunistic fungus can infect the mouth, vagina, and diaper area
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Candida albicans
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In recent years, outbreak investivations in dialysis and other health-care settings have demonstrated that mishandling of parenteral medicaion vials can contribute to the risk for hepatitis C virus HCV infection" This is a quote from the 8/15/08 MMWR. How are parenteral medicines given to patients?
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in some way that involves a break in ghe skin, such as injection
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Chicken pox
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herpesvirus
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skin infections resembling spider bites
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a gram-positive catalase-positive coccus.
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opportunistic burn infections
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Pseudomonas aeruginosa
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Impetigo
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Streptococcus pyogenes
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One way that CA-MRSA and HA-MRSA are the same is
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they are both coagulase positive
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From 3/07 Applied and Environmental Microbiology: "rotavirus was detected on 16 to 30% of fomites in day care" Which of the following is a fomite that might be found in a day care?
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toys
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Suppose the infectious dose for Pathogen X is 10,000 cells. If patients are passively immunized against Pathogen X, which of the following is the most reasonable infectious dose in the immunized patients?
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10,000,000 cells
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A serious disease that is occurring all over the planet is
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a pandemic
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According to a page at virology-online, the cytopathic effect fo Varicella Zoster Virus is unique. In other words,
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the virus tha tcauses chickenpox produces unique and visible changes to cells
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If an epidemiologist reports that there are currently 5,280 people sick with a certain disease, he/she is reporting
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prevelence
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What is the typical habitat for Clostridium ramosum? Habitat = the place where an organism lives.
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vagina
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How might this doctor have established that the transient bacteremia was indeed transient?
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gram stain a pure culture,
vaginal swabbing
observing that C. ramosum was found only sporadically in blood.
all of the above
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As of October 27 there have been 93 deaths in children from H1N1 influenza." This sentence describes
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mortality
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What role do fleas play in epidemiology of plague
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they are a vector
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What role do rodents play in the epidemiology of plague?
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Y. pestis lives in rodents (reservoir)
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Does the boxed text suggest that Y. pestis is being frequently re-introduced into populatkions of rodents
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No, it is permanently established in many rodent populations.
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Which of the following is a real difference between endotoxins and exotoxins?
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Only Gram-negative bacteria make endotoxins, and only gram-positive bacteria make exotoxins.
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A 15 year old girl has a rash fever adn hypotension. She feels sick and weak. Her blood is cultured but no bacterial grow she is just finishing her menstrual period. She sometimes forgets to chane a tampon more than once a day. Which one of the following is probably NOT related to this girl's illness?
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bacteremia
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How could these scientists possibly know whether the MRSA were community acquired or hospital aquired, since the bacteria were actually found on public beaches
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These 2 types of bacterial are genetically distinct, so they might have looked at what genes the beach bacteria had.
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You have a gram-positive coccus that is catalase-negative. It might be a ____ but it's certainly not a staphylococcus
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streptococcus, staphylococcus
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If drinking water is not properly disinfected, people whodrink this water are at risk of diseases with ____ transmission.
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fecal-oral
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In question 42, water would be considered a ____ for transmission
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vehicle
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A patient has a bloodstreme infection with a Group B Streptococcus

Could the infecting organism be streptococcus pyogenes?
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No
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What is the gram stain shape of the Group B Streptococcus?
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Gram + coccus
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Na is the atomic symbol for sodium
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True
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Xylitol is a small phospholipid that reduces rates of tooth decay.
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False
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A virus is best defined as an extremely small, parasitic cell
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False
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Dextran is a polysaccharide that helps bacteria stick to teeth and form biofilms
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True
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Gram negative bacteria use waxes in their outer membrane to protect them from toxic chemicals
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False
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Phospholipids are a type of polysaccharide.
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False
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