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Chapter 22: Problem 28

Which statement about diseases is false? a. An epidemic is a disease that occurs in a high number of individuals in a population at a time. b. A pandemic is a widespread, usually worldwide, epidemic. c. An endemic disease is a disease that is constantly present, usually at high incidence, in a population. d. An emerging disease is a disease that has appeared in a population for the first time.

Short Answer

Expert verified
c. An endemic disease is usually not present at high incidence.

Step by step solution

01

Understand Epidemic

An epidemic refers to an outbreak of a disease that affects a large number of individuals within a population, community, or region at the same time.
02

Understand Pandemic

A pandemic is an epidemic that has spread over multiple countries or continents, usually affecting a large number of people globally.
03

Understand Endemic Disease

An endemic disease is one that is regularly found and consistently present within a particular geographic area or population.
04

Understand Emerging Disease

An emerging disease is a disease that is either newly recognized within a population or is a previously known disease that is rapidly increasing in incidence or geographic range.
05

Identify the False Statement

Compare the definitions: statement c suggests that an endemic disease is constantly present and has a high incidence, which is incorrect. For an endemic disease, the incidence is typically consistent but not necessarily high.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Epidemic
An epidemic is a sudden increase in the number of cases of a disease above what is normally expected in that population in that area. It can occur when infectious agents such as viruses, bacteria, or parasites spread rapidly among individuals. Epidemics can cause serious disruptions to populations due to their unexpected nature.

Key points to remember about epidemics:
  • An epidemic is usually localized to a specific area, such as a city, region, or country.
  • The number of cases often increases quickly, leading to panic and a need for rapid response.
  • Health organizations track and manage outbreaks to prevent them from spreading further.
Understanding the dynamics of an epidemic helps in planning effective public health interventions.
Pandemic
A pandemic is essentially an epidemic that has spread across multiple countries or continents, affecting a large number of people worldwide. Due to the global spread, pandemics require coordinated international responses and resources.

Important aspects of pandemics:
  • Pandemics often result from new infectious agents to which the population has little or no immunity.
  • The effects of a pandemic can be widespread, affecting health, economy, and social structures globally.
  • Examples include the COVID-19 pandemic, the 1918 Spanish flu, and the H1N1 influenza pandemic.
Global cooperation and timely sharing of medical knowledge are crucial for controlling pandemics.
Endemic Disease
An endemic disease is a disease that is regularly found among particular people or in a certain area. The occurrence of the disease is stable and constant in that region. Unlike epidemics, endemic diseases are predictable and persistent.

Key features of endemic diseases:
  • The incidence rate remains relatively stable over time.
  • They are usually managed over long periods with control measures in place.
  • Examples include malaria in certain tropical regions or the common cold in all place.
It's important to note that the presence of an endemic disease doesn't necessarily mean high incidence; it can be low but consistently present.
Emerging Disease
Emerging diseases are those that are newly identified or have existed previously but are rapidly increasing in incidence or geographic range. These diseases can be caused by a variety of factors including ecological changes, human behavior, and advancements in travel and trade.

Characteristics of emerging diseases:
  • Often emerge from animal reservoirs (zoonotic diseases).
  • Can also appear due to changes in existing pathogens or the environment.
  • Examples include Ebola, Zika virus, and severe acute respiratory syndrome (SARS).
Understanding and monitoring emerging diseases is crucial for early intervention and prevention strategies.

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Most popular questions from this chapter

Extremophiles are considered an important area for research in the development of therapeutic drugs or industrial applications. Why do you think this is so? a. Extremophiles can be altered genetically in vitro to allow them to live in extreme conditions and this capability of alteration can be used to help humans. For example, some water-resistant prokaryotes have developed DNA repair mechanisms. Also, they could be developed and used in the treatment of human disease. b. Extremophiles have specialized adaptations that allow them to live in extreme conditions. These adaptations can be mobilized to help humans. For example, some water-resistant prokaryotes have developed DNA repair mechanisms. Also, they could be developed and used in the treatment of human disease. c. Extremophiles can be altered genetically in vitro to allow them to live in extreme conditions and this capability of alteration can be used to help humans. For example, some radiation-resistant prokaryotes have developed DNA repair mechanisms. Also, they could be developed and used in the treatment of human disease. d. Extremophiles have specialized adaptations that allow them to live in extreme conditions. These adaptations can be mobilized to help humans. For example, some radiation- resistant prokaryotes have developed DNA repair mechanisms. Also, they could be developed and used in the treatment of human disease.

Why is the processing of foods with prokaryotes considered an example of early biotechnology? a. Prokaryotes have been used to only make specific food products like cheese, wine, bread, beer and yogurt since before the term biotechnology was coined. b. Prokaryotes have been used to make and alter specific food products like cheese, wine, single cell proteins, beer and yogurt since before the term biotechnology was coined. c. As prokaryotes have been used to make and alter specific food products like cheese, wine, bread, beer and yogurt since before the term biotechnology was coined. d. As prokaryotes have been used to alter specific food products like cheese, wine, bread, beer and yogurt since before the term biotechnology was coined.

Pseudopeptidoglycan is a characteristic of the walls of some _______ a. eukaryotic cells b. bacterial prokaryotic cells c. archaean prokaryotic cells d. bacterial and archaean prokaryotic cells

In a hypothetical research situation, scientists discover bacterial endospores in silt at the bottom of a marsh that has been contaminated with a pollutant for 25 years. The silt of the marsh was deposited in annual layers. The age of the endospores can be estimated, then, by identifying the layer of silt in which the endospores are found. In flask A, researchers place 20-year-old endospores along with growth medium and the pollutant. In flask B, researchers place 100-year-old endospores along with growth medium and the pollutant. Suppose the researchers observe the flasks for a while, continuing to replenish growth medium and pollutant as necessary. Which statement describes the results you would expect to see in the growth of the flasks after some time? a. The growth in flask A will continue to exceed that of flask \(\mathrm{B}\) . b. The growth in flask \(\mathrm{B}\) will exceed continue to exceed that of flask A. c. Eventually, the difference in the growth in each d. Eventually, will be little to no growth in each flask.

Ammonification is the process by which________ a. ammonia is released during the decomposition of nitrogen-containing organic compounds b. ammonium is converted to nitrite and nitrate in soils c. nitrate from soil is transformed to gaseous nitrogen compounds d. gaseous nitrogen is fixed to yield ammonia
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