Every Year the Common Flu Vaccine Is Designed to Protect

question 41

Multiple Choice

Every year the common flu vaccine is designed to protect against three different strains of the influenza virus.Why do scientists typically have to make a new vaccine every year?

• A)because our bodies develop resistance to the vaccine and it becomes less effective
• B)because the virus develops resistance to the vaccine
• C)because the virus cannot mutate into new strains
• D)because people change their habits each year and become susceptible to different strains of the virus
• E)because the common influenza virus can come from many species of animals,including cats and dogs

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Definitions:

Blind Spots

Regions in the visual field where no image is detected because no photoreceptors are present, notably where the optic nerve exits the eye.

Camera-Vision

A method of vision similar to how a camera operates, typically referring to the ability of some organisms to focus light onto a receptor surface to form a visual image.

Live-Virus Vaccine

A vaccine that uses a weakened form of the virus to stimulate the immune response without causing the disease.

Polio Vaccine

A vaccine designed to provide immunity against poliomyelitis, a disease caused by the poliovirus.