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
irina [24]
3 years ago
11

A primary reason for needing a new vaccine for influenza each year is that _____. See Concept 43.4 (Page 970) A primary reason f

or needing a new vaccine for influenza each year is that _____. See Concept 43.4 (Page 970) influenza is a disease that causes the apoptosis of all memory cells mutation in the influenza virus is frequent the influenza virus might proliferate in different tissues during each subsequent year, and immune memory is limited to those tissues initially infected the first infection with influenza weakens the immune system immunity typically disappears one month after recovery from a disease
Health
2 answers:
Triss [41]3 years ago
4 0

Answer:

A primary reason for needing a new vaccine for influenza each year is that mutation in the influenza virus is frequent.

Explanation:

Influenza Viruses mutation is known as Antigenic shift.

This is the random accumulation of mutations in the haemagglutinin (HA), and to a lesser extent neuraminidase (NA) genes, recognized by the immune system. It is most pronounced in influenza A viruses.

As is the case in all RNA viruses, mutations in influenza viruses occur frequently because the virus' replication machinery does not have a proofreading mechanism. When such changes cause mutations in the antigenic sites of the HA or NA genes, which reduce or inhibit the binding of neutralizing antibodies (the basis for resolving infection in an individual), the virus may evade the immune system.

This process is the occurrence of seasonal influenza epidemics that may differ in severity and age groups affected. It also accounts for vaccine mismatch when one of the strains selected for the vaccine does not optimally match the circulating strains. As a result, annual changes in the composition of influenza vaccines are necessary.

Antigenic drift in the NA can lead to resistance against neuraminidase inhibitors. Antigenic drift may also allow a virus to cross the species barrier to a new host.

Maurinko [17]3 years ago
3 0

Answer:

Mutation in influenza virus occurs frequently.

Explanation:

It is possible for the influenza virus to increase in different tissues during each subsequent year, and immune memory is limited only to those tissues that have been initially infected.

The initial nfection with influenza weakens the immune system.

Mutation in the influenza virus occurs frequently.

You might be interested in
You do not have to yield to pedestrianxs if they are not crossing the crosswalk
vredina [299]

Answer:

true

Explanation:

4 0
3 years ago
Six external parts of a computer
iVinArrow [24]
Speakers, printers, modems, network routers and external<span>storage devices are other </span>external<span> devices. is this correct</span>
7 0
2 years ago
Freud believes that dreams are a tool for
julia-pushkina [17]
The anwser is letter A
8 0
2 years ago
Read 2 more answers
3. To ensure the greatest nutritional benefits, dietary guidelines suggest which of the following? A. Washing foods before eatin
stiks02 [169]

The answer would be D. Eating nutrient-dense foods

5 0
3 years ago
Read 2 more answers
After your mother's operation, she was relieved that all the colors on the TV seem more vivid and the headlights on cars now loo
Ivenika [448]
Her eye vision is the answer
6 0
3 years ago
Other questions:
  • Stress is a factor that contributes to heart disease risk. Please select the best answer from the choices provided. T F
    7·2 answers
  • Which of these are useful strategies for preventing some STDs/STIs? Select the three correct answers. A. Mutual monogamy B. Incr
    8·1 answer
  • Why does the Christian need to have his or her mind renewed? <br><br> pleases help
    13·1 answer
  • Mrs. Lyons is in good health, uses a single prescription, and lives independently in her own home. She is attracted by the idea
    8·1 answer
  • What is the purpose of setting a deadline for a goal
    12·1 answer
  • Which sport is considered both an aerobic and an anaerobic activity?
    12·1 answer
  • A group of students is studying for a test on traction. The students demonstrate understanding of the types of traction when the
    11·1 answer
  • unc lfit Ballistic stretching Causes the muscle to stretch to its maximum potential Isolates the target muscle Causes the muscle
    5·1 answer
  • Which mitosis comes before the parent cell divides into two new nulcei
    13·1 answer
  • What are two tasks that need to be done to get the office ready for the day​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!