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Print version: page 38 CDC uses mathematical modeling to estimate the burden of illness associated with influenza in terms of cases, hospitalizations and deaths. Make it easy to ask for and give help by setting the tone, norms, and practices in your work environment.

However, repeated annual vaccination also can be beneficial during some seasons, since sometimes people retain and carry over immune protection from one season to the next. Vaccination has been found in most seasons to provide a similar level of protection against flu illness in children to that seen among healthy adults. The amount of protection provided by flu vaccines may vary by influenza virus type or subtype even when recommended flu vaccine viruses and circulating influenza viruses are alike (well matched). Since 2009, VE studies looking at how well the flu vaccine protects against medically attended illness have suggested that when vaccine viruses and circulating flu viruses are well-matched, flu vaccines provide better protection against influenza B or influenza A (H1N1) viruses than against influenza A (H3N2) viruses. During years when there is a good match between the flu vaccine and circulating viruses, it is possible to measure substantial benefits from flu vaccination in terms of preventing flu illness and complications. Flu vaccines do NOT protect against infection and illness caused by other viruses that also can cause flu-like symptoms.

However, in some seasons, partially vaccinated children still receive some protection. 3115 0 obj <> endobj We can shake off poor advice and out-of-date ideas, and have the … However, protection against influenza A(H3N2) flu viruses has been less consistent. For that reason, most U.S. studies conducted to determine the benefits of flu vaccination are “observational studies.”, “Observational studies” compare the occurrence of flu illness in vaccinated people compared to unvaccinated people, based on their decision to be vaccinated or not.

The Benefits of Good Research. Take, for example, a VE point estimate of 60%. By Lea Winerman. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. Specifically, flu vaccines have reduced the risk of medically attended illness caused by H1N1 or B by more than 60% on average among people age65 and older (1). While determining how well a flu vaccine works is challenging, in general, recent studies have supported the conclusion that flu vaccination benefits public health, especially when the flu vaccine is well matched to circulating flu viruses. The vaccine’s effectiveness also can vary depending on who is being vaccinated. Recent studies show flu vaccine can reduce the risk of flu illness by between 40% and 60% among the overall population during seasons when most circulating flu viruses are well matched to the flu vaccine viruses. From there, these two types can be divided into multiple categories. 11.

�9ri���W]�C���~g��6�pP�������%6�J�L����¤�̌wd�����/d/�T��&��9����3;|V�ճ��'�e5�����y�Z7'��*���L�.��]��3�:�����+p��ZP)6�H�Z�G0���Ǜ����b 7� n���Ƙ�@.���غ)��O�*���U��W/!�'�E�{ ��CL� To assess how well the vaccine works across different age groups, CDC’s studies of flu vaccine effects have included all people aged 6 months and older recommended for an annual flu vaccination. Psychologists are studying why people volunteer, and how organizations can hold on to volunteers in the long term. Why is flu vaccine typically less effective against influenza A H3N2 viruses? Flu vaccine can be lifesaving in children. What factors influence how well the vaccine works? Repeated annual influenza vaccination and vaccine effectiveness: review of evidence.

However, based on the substantial burden of flu in the United States, and on the fact that most studies point to vaccination benefits, CDC recommends that yearly flu vaccination remains the first and most important step in protecting against flu and its complications.

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