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you see viruses have the ability to mutate to better it's survival in the hosts body since your immune sysem records data on them before they mutate we can be effected the next year because of it's changes. In other words it can mutate it self over and over to keep it self going. example the common cold you can catch a different cold from the same virus because it mutated in the hosts body.
What else can I help you with?
What genetic material in viruses?
The hereditary material of viruses vary. Some viruses have DNA and some RNA. Viruses with RNA change, for example the flu, that's why we get a shot every year. The viruses with DNA don't change so that's why you need only one shot.
Why is it that a new vaccination for the common cold needs to be made every year?
Common cold is caused by a virus. Viruses, when infecting people, constantly change, so scientists always have to make a new vaccine.
Why is it important that a new vaccine be produced every year?
to avoid development of resistance of strain of bacteria or viruses.
Why do vaccines have to be changed every year?
Because certain viruses and bacteria evolve to become resistant to the old vaccines.
How does earth climate change every year?
The Earth climate changes every year due to increased human activity on it. The green house gases too are largely responsible for climate change every year.
When to change filter sand?
Every year
What year did daylight hours change?
except for the equator, every year
Why do sand dunes change shape and size every year?
They change shape every time the wind blows.
What is a sentence with word delta or change?
The waterways of this delta change every year.
What year did Nickelback's band members change?
Every year, age is inevitable.
How often to change the bulbs?
You should change them once a year. We have the same lights, just to be sure it doesn't hurt to change them every year.
How many people get infected from viruses every year?
It is difficult to provide an exact number of people infected with viruses globally each year as it varies depending on the type of virus and region. However, millions of people worldwide are affected by viral infections annually.
