Influenza viruses have a great capacity to mutate and change.
In light of this, a new vaccine is made every year to protect against the current strains. In addition, immunity provided by an influenza vaccine begins to fade after a year.
This site uses cookies. By continuing to browse the site, you are agreeing to our use of cookies.
OKLearn moreESWI uses cookies on www.eswi.org (the "Service"). By using the Service, you consent to the use of cookies.
Our Cookies Policy explains what cookies are, how we use cookies, how third-parties we may partner with may use cookies on the Service, your choices regarding cookies and further information about cookies.
What are cookies:
Cookies are small pieces of text sent by your web browser by a website you visit. A cookie file is stored in your web browser and allows the Service or a third-party to recognize you and make your next visit easier and the Service more useful to you.
Cookies can be "persistent" or "session" cookies.
How ESWI uses cookies:
When you use and access the Service, we may place a number of cookies files in your web browser.
We use cookies for the following purposes: to enable certain functions of the Service, to provide analytics and to store your preferences.
We use both session and persistent cookies on the Service and we use different types of cookies to run the Service.
Third-party cookies:
In addition to our own cookies, we may also use various third-parties cookies to report usage statistics of the Service.
What are your choices regarding cookies:
If you'd like to delete cookies or instruct your web browser to delete or refuse cookies, please visit the help pages of your web browser.
Please note, however, that if you delete cookies or refuse to accept them, you might not be able to use all of the features we offer, you may not be able to store your preferences, and some of our pages might not display properly.
These cookies are strictly necessary to provide you with services available through our website and to use some of its features.
Because these cookies are strictly necessary to deliver the website, you cannot refuse them without impacting how our site functions. You can block or delete them by changing your browser settings and force blocking all cookies on this website.
These cookies collect information that is used either in aggregate form to help us understand how our website is being used or how effective our marketing campaigns are, or to help us customize our website and application for you in order to enhance your experience.
If you do not want that we track your visist to our site you can disable tracking in your browser here:
We also use different external services like Google Webfonts, Google Maps and external Video providers. Since these providers may collect personal data like your IP address we allow you to block them here. Please be aware that this might heavily reduce the functionality and appearance of our site. Changes will take effect once you reload the page.
Google Webfont Settings:
Google Map Settings:
Vimeo and Youtube video embeds: