Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 15, Problem 5MCQ
The ID50 for Campylobacter sp. is 500 cells; the ID50 for Cryptosporidium sp. is 100 cells. Which of the following statements is false?
- a. Both microbes are pathogens.
- b. Both microbes produce infections in 50% of the inoculated hosts.
- c. Cryptosporidium is more virulent than Campylobacter.
- d. Campylobacter and Cryptosporidium are equally virulent; they cause infections in the same number of test animals.
- e. Cryptosporidium infections are more severe than Campylobacter infections.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Approximately 50% of the world’s population is colonised by Helicobacter pylori
(H. pylori), yet only a fraction of the population develops gastric ulcers.
A. Why is there a discrepancy between the frequency of H. pylori colonization and
the frequency of gastric ulceration? Is H. pylori colonization responsible for
gastric ulcers?
B. Should a vaccine against H. pylori be developed and administered for
everyone? Justify your reasoning.
All of the following statements concerning endotoxins are correct except:
Select one:
A. they are produced only by Gram (+) cells
B. they consist primarily of lipopolysaccharides
C. they have systemic, rather than targeted, effects of the host
D. they must be present in relatively high doses to effect the host
E. they are released from a pathogen when it is dead or dying
Which of the following is not true?
a.
Cockroaches can transport a variety of parasites, usually on their external surface. This is an example of mechanical transmission by a vector
b.
A contamination will inevitably lead to an infection
c.
Case fatality rate is one of the indicators of virulence of an infectious agent
d.
None of the pandemics prior to COVID-19 were caused by a coronavirus
Chapter 15 Solutions
Microbiology: An Introduction (13th Edition)
Ch. 15 - Compare pathogenicity with virulence.Ch. 15 - How are capsules and cell wall components related...Ch. 15 - Prob. 3RCh. 15 - Explain how drugs that bind each of the following...Ch. 15 - Prob. 5RCh. 15 - Prob. 6RCh. 15 - Prob. 7RCh. 15 - Which of the following genera is the most...Ch. 15 - How can viruses and protozoa avoid being killed by...Ch. 15 - Prob. 10R
Ch. 15 - The removal of plasmids reduces virulence in which...Ch. 15 - Prob. 2MCQCh. 15 - Prob. 3MCQCh. 15 - All of the following can occur during bacterial...Ch. 15 - The ID50 for Campylobacter sp. is 500 cells; the...Ch. 15 - Prob. 6MCQCh. 15 - A drug that binds to mannose on human cells would...Ch. 15 - The earliest smallpox vaccines were infected...Ch. 15 - Prob. 9MCQCh. 15 - Which of the following statements is true? a. The...Ch. 15 - Prob. 1ACh. 15 - Prob. 2ACh. 15 - Prob. 3ACh. 15 - How do each of the following strategies contribute...Ch. 15 - On July 8, a woman was given an antibiotic for...Ch. 15 - Explain whether each of the following examples is...Ch. 15 - Cancer patients undergoing chemotherapy are...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Sea turtles have disappeared from many regions, and one way of trying to save them is to reintroduce them to ar...
Marine Biology (Botany, Zoology, Ecology and Evolution)
Explain why hyperthermophiles do not cause disease in humans.
Microbiology with Diseases by Taxonomy (5th Edition)
What were the major microbiological interests of Martinus Beijerinck and Sergei Winogradsky? It can be said tha...
Brock Biology of Microorganisms (15th Edition)
Some people consider Pasteur or Koch to be the Father of Microbiology, rather than Leeuwenhoek. Why might they ...
Microbiology with Diseases by Body System (5th Edition)
Some people compare DNA to a blueprint stored in the office of a construction company. Explain how this analogy...
Biology: Concepts and Investigations
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- which organism most easily causes an infection? a. shigella - ID50-10 b. legionella pnemiphila - ID20-1 c. E.coli 0156-20 d. Treponema pallidum - ID50-57 e. can't tellarrow_forwardBased on the figures given, 1. What range of time and temperature combinations poses the highest risk? 2. Explain briefly why hazards and risks decrease as temperature decreases from 55oC upwards. 3. Discuss briefly why after 100 hours, the risk decreases even if the temperature is optimal for growth of pathogens. 4. Write a conclusion explaining the relationship between time and temperature as illustrated in the two figures.arrow_forwardThe following are the limitations of Koch's postulates EXCEPT: A. some pathogens cannot grow on artificial media and therefore cannot be identified as the causative agent of the disease B. some diseases involve multiple pathogens which produce similar symptoms making it difficult to pinpoint the causative agent C. some diseases are host-specific and re-inoculation may pose ethical concerns D. some microorganisms are present in the body fluids of the infected animal which make them difficult to be culturedarrow_forward
- You have a suspension of fungal cells and have narrowed it down to 2 different types of fungus. You have solutions of 2 types of antibodies. 1. Antibody A recognizing and antigen on Fungus A 2. Antibody B recognizing and antigen on Fungus B The antibodies you have on hand are NOT labeled with an enzyme, dye, or fluorescence and you do NOT have sheep's blood. Which test would you do to determine this if your sample is Fungus A or Fungus B. A. precipitin B. agglutination C. complement fixation D. fluorescently labeled microscopy E. ELISAarrow_forwardBelow are listed the LD-50 values for toxins from specific isolates of a bacterial species. Which toxin would be considered the "most lethal"?Diptheria toxin . .1 mg/kgClostridium difficile enterotoxin A .5 mg/kgV. cholerae toxin 250 mg/kgB. pertussis toxin 15 mg/kg a)diptheria toxin b)enterotoxin A c)V. cholerae toxin d)B. pertussis toxinarrow_forwardDefine the following terms: a. endotoxin b. periplasmic space c. slime layer d. lipopolysaccharide e. pilusarrow_forward
- The transmission coefficient of the hypothetical disease Blady flu is 0.6. If the combined death and recovery rate is 0.3, what is the threshold density for Blady flu?arrow_forwardBelow are a list of virulence factors/ strategies paired with an example of an organism that utilizes them. How do each of the following strategies contribute to the virulence of the pathogen? Strategy - Causes the host to produce more receptors (Organism - Rhinovirus) Strategy - Produces gas as a product of fermentation (Organism - Clostridium perfringens) Strategy - Produces a capsule (organism - Klebsiella pneumonia) Strategy - Ability to move between adjacent cells (organism - Cytomegalovirus) Strategy - Ability to use pilus as a motility structure (organism - Pseudomonas aerogenosa)arrow_forwardA young Honduran female patient presented with a huge cutaneous ulcer involving the right shoulder. She had been involved in an agricultural clearance project in the interior of the country. a. What parasite/s might cause such a lesion? b. How would you diagnose this infection? c. How is this infection usually acquired? d. How do these parasites evade the immune response?arrow_forward
- Methicillin-resistant Staphylococcus aureus (MRSA) is a common nosocomial pathogen that is increasing in frequency in community settings. Describe the most common mechanism of resistance by S. Aureus? What treatment can be used?arrow_forwardWhat are the social and economic implications of the following scenarios:a. Secondary metabolites are not produced by microorganismsb. Glucose is the only and main source of energy of Alcanivorax borkumensis.c. Microorganisms are unable to thrive in polluted environments.arrow_forwardA 30year old male patient who was a contractor and building inspector in the Greater Accra region complained of difficulty breathing and was admitted to the hospital with severe respiratory disease. The physician noted a high fever and cough. Two days before, the patient had inspected an old warehouse abondoned and infested with rodents. The patient was given intravenous antibodies, but 2 days into therapy the pneumonia worsened and he developed pulmonary edema. a. Which organisms should be suspected of causing this illness? b. Which organisms should be suspected of causing this illness ? c. Outline the steps involved in gram staining. d. Why is testing for rhesus factor ( Rh) antigens and antibodies different from ABO testing.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education
Infectious Diseases - How do we control them?; Author: Let's Learn Public Health;https://www.youtube.com/watch?v=2JWku3Kjpq0;License: Standard Youtube License