
Introduction:
Infection is the whole process of entry of the disease-causing agents in the body of an organism, their multiplication and the production of toxins by them. Infections can be caused by bacteria, viruses, prions, nematodes, arthropods, and various other infectious agents.

Answer to Problem 1NP
Correct answer:
The progression of infection is promoted by the proper portal of entry, lack of previous exposure to infection, and host immunosuppression. Therefore, options (b), (d), and (e) are correct.
Option (b) is given as “proper portal of entry”, option (d) is given as “no previous exposure to this infection”, and option (e) is given as “host immunosuppression”.
Explanation of Solution
Justify reason for the correct statement:
The way through which infectious agent enters the body of the host is known as the portal of entry. This provides access to the tissues where infectious agents multiply. The portal of entry plays an important role, for example, influenza virus enters the respiratory tract through the inhalation of droplets.
Without prior exposure to the infection, the body does not have antibodies against this pathogen. It takes time to generate antibodies. The infectious agents take advantage of it and multiply at a faster rate.
Immuno-compromised and immune-suppressed individuals have a weak immune system which is not able to generate antibodies and fight against the disease. So infectious agents enter their body easily and infect different tissues.
Hence, options (b), (d), and (e) are correct.
Justify reasons for the incorrect statements:
Option (a) is given as “low microbial virulence”.
Virulence can be defined as the extent of damage that can be caused by any microbe. Low virulence refers to the low extent of the damage. This way, the pathogen cannot multiply within the body of hosts. Hence, it is a wrong answer.
Option (c) is given as “genetic profile of host resistance to microbe”.
Genetic profile of host resistance to infectious agent or microbe is not very important since the body of host responds to each of the microbes in its own manner and first exposure to the microbe is an example that genetic profile is not so important. Hence, it is a wrong answer.
Hence, options (a) and (c) are incorrect.
The progression of an infection depends on the correct portal of entry, no previous exposure to this infection, and host immunosuppression.
Want to see more full solutions like this?
Chapter 11 Solutions
Connect with LearnSmart Labs Online Access for Microbiology Fundamentals
- What is behavioral adaptarrow_forward22. Which of the following mutant proteins is expected to have a dominant negative effect when over- expressed in normal cells? a. mutant PI3-kinase that lacks the SH2 domain but retains the kinase function b. mutant Grb2 protein that cannot bind to RTK c. mutant RTK that lacks the extracellular domain d. mutant PDK that has the PH domain but lost the kinase function e. all of the abovearrow_forwardWhat is the label ?arrow_forward
- Can you described the image? Can you explain the question as well their answer and how to get to an answer to an problem like this?arrow_forwardglg 112 mid unit assignment Identifying melting processesarrow_forwardGive only the mode of inheritance consistent with all three pedigrees and only two reasons that support this, nothing more, (it shouldn't take too long)arrow_forward
- Oarrow_forwardDescribe the principle of homeostasis.arrow_forwardExplain how the hormones of the glands listed below travel around the body to target organs and tissues : Pituitary gland Hypothalamus Thyroid Parathyroid Adrenal Pineal Pancreas(islets of langerhans) Gonads (testes and ovaries) Placentaarrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningMicrobiology for Surgical Technologists (MindTap ...BiologyISBN:9781111306663Author:Margaret Rodriguez, Paul PricePublisher:Cengage LearningEssentials of Pharmacology for Health ProfessionsNursingISBN:9781305441620Author:WOODROWPublisher:Cengage

