BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 26.4, Problem 2LO
Summary Introduction
To relate: The antigenic shift and antigenic drift to seasonal flu outbreaks and pandemics.
Introduction: The diseases caused by viral infections are categorized into acute or persistent infections. This classification is based on how the viruses are produced rapidly and frequently and on the appearance of the associated symptoms.
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Explain why a different influenza vaccine is necessary every year. How is this different from the development of pandemic versions? Please include in your answer the terms antigenic shift and antigenic drift.
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Chapter 26 Solutions
BIOLOGY
Ch. 26.1 - Prob. 1LOCh. 26.1 - Prob. 2LOCh. 26.2 - Prob. 1LOCh. 26.2 - Prob. 2LOCh. 26.3 - Prob. 1LOCh. 26.3 - Describe how viruses can contribute DNA to their...Ch. 26.4 - Describe the differences between acute and...Ch. 26.4 - Prob. 2LOCh. 26.4 - Prob. 3LOCh. 26.5 - Prob. 1LO
Ch. 26 - Prob. 1UCh. 26 - Prob. 2UCh. 26 - Prob. 3UCh. 26 - Prob. 4UCh. 26 - Why is a drug that blocks HIV binding to one of...Ch. 26 - Prob. 6UCh. 26 - Prob. 7UCh. 26 - Prob. 1ACh. 26 - Prob. 2ACh. 26 - Prob. 3ACh. 26 - Prob. 4ACh. 26 - Prob. 5ACh. 26 - Prob. 6ACh. 26 - Prob. 7ACh. 26 - E. coli lysogens derived from infection by phage ...Ch. 26 - Prob. 2SCh. 26 - Prob. 3SCh. 26 - Prob. 4SCh. 26 - Prob. 5S
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- X is a zoonotic infection first identified in humans in 1970 in the Democratic Republic of Congo. The infection presents clinically with fever, rash and swollen lymph nodes and may lead to a range of medical complications. X was first identified outside of Africa in 2003 and later reported in the United States of America, linked to contact with infected pet prairie dogs. The pets were reportedly housed with Gambian pouched rats and dormice, imported from Ghana. X has also been further reported in travelers from Nigeria to different countries around the world between 2018 and 2021. This resulted in multiple cases of X identified in several non-endemic countries in 2022, including South Africa. 3.1 Explain the clinical symptoms and laboratory diagnosis of infection X( five each)arrow_forwardX is a zoonotic infection first identified in humans in 1970 in the Democratic Republic of Congo. The infection presents clinically with fever, rash and swollen lymph nodes and may lead to a range of medical complications. X was first identified outside of Africa in 2003 and later reported in the United States of America, linked to contact with infected pet prairie dogs. The pets were reportedly housed with Gambian pouched rats and dormice, imported from Ghana. X has also been further reported in travelers from Nigeria to different countries around the world between 2018 and 2021. This resulted in multiple cases of X identified in several non-endemic countries in 2022, including South Africa.2.1 Identify the infection (X) and provide a detailed description of the causative agent. (10)2.2 Discuss the transmission and pathogenesis of the virus that causes infection X. (10)2.3 Explain the clinical symptoms and laboratory diagnosis of infection X. (10)2.4 Discuss the importance of…arrow_forwardWhy is virulence expected to increase with vector or water-borne transmission, relative to direct transmission? Using the concept of a “cost of virulence”, explain how vertical transmission or transmission in a hospital is thought to affect the level of virulence favored by natural selection?arrow_forward
- Yearly vaccination is the primary means of preventing and controlling flu outbreaks. Here 'yearly' is important because: New vaccines with better efficacy are produced each year Circulating strains of influenza viruses change from year to year New vaccines with up-to-date strain components are produced each year Who is at higher risk of developing severe pneumonia when infected with SARS-CoV-2? An undergraduate A student at high-school A 6-month-old baby A 70 years old man with diabetes and high blood pressurearrow_forwardc) Discuss 'antigenic drift' and 'antigenic shift' in the influenza virus and explain how such mutations can result in an epidemic.arrow_forwardDescribe the ways in which each of the following pathogens can disarm their host’s immune system or manipulate it to their own advantage:a. Pathogenic strains of Staphylococcusb. Enveloped virusesarrow_forward
- Compare Influenza A, Influenza B, SARS-Cov2, and a common cold virus. Include: Structure (Envelope? Spikes? Genome? Entry and exit mechanism?) What is the specific antigen on the virus that the immune system recognizes? How does it spread? What are the symptoms? What causes the seasonality? How to prevent infection?arrow_forwardSelect 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…arrow_forwardHow does geographical location and socioeconomic status affect the experience of health, disease, and prevention as it relates to the US and the 1993 Hantavirus? whats can you conclude from the above ?arrow_forward
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