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Some Reasons Vaccines Are Given in Multiple Doses

Some people wonder why most vaccines require multiple doses. The reasons vary depending on the vaccine. Review the table below to learn more.

Reason for multiple doses Vaccine example
To protect those who didn’t respond to the first dose Chickenpox vaccine
Additional doses provide a greater immune response than that generated after the first dose Haemophilus influenzae type b vaccine
The immune response lasts longer after more than one dose is received Pertussis vaccine
The vaccine protects against a virus that changes enough so that immunity to older versions wouldn’t be protective Influenza vaccine

April 2014

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Arizona, cruise ships, NFL stadiums … and influenza?

What does the population of Arizona, the number of passengers on more than one thousand cruise ships and the number of fans in a full NFL stadium have in common? The number of people making up each situation is comparable to recent data from the CDC regarding the effectiveness of the influenza vaccine during the 2012-2013 influenza season:

Less than half of all people older than 6 years of age received the influenza vaccine during the 2012-2013 influenza season. If more people were vaccinated, the numbers of influenza-related illnesses and hospitalizations averted through vaccination would have been substantially higher.

Check out this related infographic. 

March 2014

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The impact of vaccines

Every day we hear about the power of vaccines and their tremendous impact on public health. But have you ever wondered what this effect would be if it was put into numbers? Well, wonder no more!

In November 2013, Donald Burke and co-workers published a paper in the New England Journal of Medicine that estimated the number of cases of diseases prevented by vaccines. Here are some highlights from their findings:

February 2014

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January is "Cervical Cancer Awareness" Month

January is “Cervical Cancer Awareness” month. Cervical cancer is one of several types of cancer caused by HPV infection and is one of the most common cancers affecting women. Each year, 12,000 women are diagnosed with cervical cancer and about 4,200 die from the disease. Cervical cancer is most commonly caused by long-lasting infection with HPV types 16 or 18. Because the HPV vaccine protects against these two types of HPV, girls and young women age 9 through 26 years are recommended to get the HPV vaccine.

During January, check with the young women in your life to be sure they are aware of the HPV vaccine as a way to prevent cervical cancer.

Learn more about HPV and the HPV vaccine»

Janurary 2013

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