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Because certain viruses and bacteria evolve to become resistant to the old vaccines.
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∙ 12y ago
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Why don't you need other vaccines every year?
Because some vaccination are unimportant.
Why are flue vaccines given each year?
because the influenza bug changes every year. It's never exactly the same as the previous year.
Vaccines against the flu are different every year why is this?
The most prevelent strains of the flu are used to develop the vaccines. These may not be the same strains as the year before. Also, the flu symptoms change due to the atmosphere and climate.
How was earth changed during the eruption of mount Kilauea?
It has changed the world because every year it adds an estimate of 48 acers to the island every year
How many children die from vaccines each year?
i will say about 50,000 children die each year from vaccines
Do vaccines exist?
Yes, in fact many different vaccines exist for many different diseases (in the case of flu a new vaccine has to be made every year because the virus evolves so rapidly that the previous year's vaccine would not work against it).
When do struts on a Toyota Sequoia need to be changed?
The struts need to be changed every other year.
Was the Jewish Temple veil ever changed?
Every year.
When were vaccines created?
In the year 1796.
How did the vaccination change society?
Vaccines changed society because with out vaccines then there would be so many deaths. Vaccines help to prevent the disease before you get it. Why pay a visit to the doctor when you can just go get the vaccine and not have to get the disease.
What cultural things are changed every year?
food shelter clothing
Should you take your dogs to get vaccinated once a year or every three years?
To keep your dog's vaccines updated and protected from disease, take your dog for it's injection once a year.
