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examine whether the statement, "Pathogens must enter host cells to cause disease", is true or false.
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Solved in 2 steps
- Select all of the following that applies to the tradeoff between transmission and virulence that applies to many diseases. a) The tradeoff between transmission and virulence means that diseases always evolve to become more virulent. b) If greater virulence limits transmission, that disease will likely evolve to become less virulent than it could be. c) While making more copies of itself can increase the likelihood of transmission occurring, too much replication of the disease can make the host so sick it won't leave the house and spread the disease. d) A strain of a disease that replicates enough to be transmitted, but not so much that the host gets too sick to move, will be favored by natural selection over strains that either make the host too sick or do not replicate enough to be transmitted. e) If a disease can spread without making its host sick (e.g. when the host is asymptomatic), then the tradeoff between transmission and virulence…Describe three (3) methods by which pathogens are transmitted and give an example of each..Which of the following describes "incubation period"? a. It is the time interval between entry of an infectious agent into the body and the appearence of the first symptoms and/or signs of the disease b. It is the time after recovery when a person can still harbor the infection c. It is the time interval through which an infected person is able to transmit the infectious agent to others d. It is the time interval between the onset of primary and secondary cases
- Explain how specialized structures (e.g., spore, capsule, fimbriae, or flagella) enable a microbe to survive in a given environment or contribute to pathogenesis.According to the natural history of disease model, the time before the precursors of disease and the host interact is called the period of: A. Prepathogenesis B. Pathogenesis C. Primogenesis D. B and CExplain how key pathogens cause infection
- Very often, the invasion of hosts by pathogenic microbes leads to infections. Discuss the different means microorganisms use to enter and colonize a host.Choose the false statement: O A contaminated catheter might be an example of an iatrogenic infection. The size of an inoculum introduced into the host has little to do with the success or pathology of an infection. O A zoonosis is an infectious disease or pathogen that has crossed over from an animal species and begun to infect humans. O Vertical infections are those transferred from mother to child either during birth or via breastfeeding. Question 21 Choose the false statement below. O Long term consequences to a host that have been caused by infectious disease (such as heart disease after septicemia) are termed sequelae. OPortal of exit" refers to the way in which the immune system destroys an infection, or how antibiotics can be used to kill invading bacteria. O Whether or not a person is a susceptible host for disease is determined in part by where that person lives and how that person is employed.Discuss with examples why some pathogens that typically infect one system (such as the respiratory system) can cause disease in other systems (for example in the nervous system).