1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Semenov [28]
3 years ago
6

1- why dong you usually get sick from the exact same pathogen twice

Biology
1 answer:
Lilit [14]3 years ago
3 0

1: For example, rhinovirus has over 100 different serotypes. Now, the good news is that you can't get ill from the same virus serotype right after getting better, due to the fact that you'll have developed antibodies which help to protect your immune system for a little while.

2:Most children in the United States are now vaccinated against measles virus; before vaccination was widespread, most were naturally exposed to this virus and suffered from an acute, unpleasant, and potentially dangerous viral illness. Whether through vaccination or infection, children exposed to the virus acquire long-term protection from measles. The same is true of many other acute infectious diseases: this state of protection is a consequence of immunological memory.

The basis of immunological memory has been hard to explore experimentally. Although the phenomenon was first recorded by the ancient Greeks and has been exploited routinely in vaccination programs for over 200 years, it is just now becoming clear that memory reflects a persistent population of specialized memory cells that is independent of the continued persistence of the original antigen that induced them. This mechanism of maintaining memory is consistent with the finding that only individuals who were themselves previously exposed to a given infectious agent are immune, and that memory is not dependent on repeated exposure to infection as a result of contacts with other infected individuals. This was established by observations made on remote island populations, where a virus such as measles can cause an epidemic, infecting all people living on the island at that time, after which the virus disappears for many years. On reintroduction from outside the island, the virus does not affect the original population but causes disease in those people born since the first epidemic. This means that immunological memory need not be maintained by repeated exposure to infectious virus

You might be interested in
Organism at the end of a food chain
stira [4]

Answer:

is always a higher organism

Explanation:

lets take an example:

food chain consisting of zooplankton, small fish, big fish and man

as the order goes in the question ,the organism at the end of this food chain is man

5 0
3 years ago
What is the difference of cell division in cancerous cells compared to cell division in noncancerous cells?
Nesterboy [21]
Cancerous cell just continue to divide giving rise to mases of cells called tumor.

4 0
3 years ago
Why are darwin's finches considered good examples of natural selection?
Ivanshal [37]
The answer is B. they embody the idea of descent with modification.
8 0
3 years ago
Which of the following statements about the solar system's formation is true?
Alex787 [66]
The last one, the planets formed at the same distance from the sun.
8 0
3 years ago
Read 2 more answers
Pyruvate is an intermediate for 2 pathways. Comment on why one reaction pathway is preferred over the other. Include the specifi
faltersainse [42]
Glycolysis is the common initial pathway for the both catalytic degradation pathway for ATP production and the anabolic pathway for the synthesis of hydrocarbon(gluconeogenesis)

Most important glycolysis, and then gluconeogenesis
5 0
2 years ago
Other questions:
  • Which of the following is an example of a disease that is properly matched with one of its environmental risk factors?
    6·1 answer
  • Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type o
    6·2 answers
  • Checking for contents of the intestinal tract would be done during which phase of the autopsy?
    9·2 answers
  • What are examples of harmful mutations
    11·1 answer
  • Stem cells are considered pluripotent true or false?
    9·1 answer
  • Being able to perform well in a high pressure situation is a natural stress response that releases extra hormones.
    13·2 answers
  • Mark received one dominant allele for brown hair from his father and another dominant allele from his mother.
    6·1 answer
  • HELP
    14·1 answer
  • Phenylketonuria causes a severe cognitive disability due to the inability to metabolize phenylalanine. It is an autosomal recess
    7·1 answer
  • How many bacteria flagella are use for lomotion​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!