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Good question. The reason is that the virus that causes the flu is constantly mutating and changing. So the vaccine that is used this season is based on what the virus looked like at the time it was manufactured. But the virus is clever and it learns how to change, so that's why we gotta keep changing the vaccine each season.
What else can I help you with?
When was Lifetime Guarantee created?
Lifetime Guarantee was created in 1983.
What actors and actresses appeared in Lifetime Guarantee - 2011?
The cast of Lifetime Guarantee - 2011 includes: Rashid Lounes as Host
What type of immunity provides lifetime protection for the body against a specific pathogen?
Active immunity
Can you give me a sentence with the word guarantee?
I can guarantee that this will be an epic adventure. Her new tools came with a lifetime guarantee.
Does anybody give you a lifetime guarantee on there t-shirts?
Fruit of the Loom does not have a lifetime guarantee but they do have an unconditional guarantee on their products that says if you are unsatisfied with the product you can return it and get a new product or your money back.
How long does passive and active immunity last?
Active immunity can last for years or even a lifetime, as it develops after exposure to a pathogen or through vaccination, prompting the immune system to create memory cells. In contrast, passive immunity provides immediate protection but is short-lived, typically lasting a few weeks to a few months, as it involves the transfer of antibodies from another source, such as maternal antibodies to an infant.
Do master mechanic tools have a lifetime guarantee?
yes
Can tetanus be treated once symptoms appear?
Tetanus can be treated once symptoms appear, but it may become a medical emergency. It is better to have a vaccination before beginning any work that could increase the risk of tetanus. Tetanus vaccinations provide years, even a lifetime of immunity.
Why would a person have no immunity to Hepatitis B after having the hep b vaccination series done twice?
Although vaccinations are given to children and sometimes adults on a regular schedule, the immunity does not last for a lifetime as originally perceived. Vaccinations usually only protect against diseases for roughly 8 years after the vaccine has been administered.
Are s k Wayne tools lifetime guarantee?
yes
Is there a lifetime guarantee on ugly stick?
5 year limited.
Do Ugg boots come with a lifetime guarantee?
My boots are worn and damaged. It will soon be 1 year that I have had them, is there a lifetime guarentee on these?
