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The English language content on this website is being archived for historic and reference purposes only. Print Updates Subscribe Podcasts. The U. The vaccine was effective but caused side effects. This rare condition causes the immune system to attack healthy nerve cells, leading to weakness and mobility problems. There were also claims that the vaccine was responsible for several other neurological problems, such as multiple sclerosis and optic neuritis.
However, the Institute of Medicine Immunization Safety Review Committee concluded a lack of evidence to support these claims. This put a greater emphasis on the small rise in health complications following vaccination because it was not preventing swine flu cases. There were reports of some people from several European countries developing narcolepsy after receiving the swine flu vaccine. However, the CDC found no evidence of a link between the vaccine and narcolepsy in the U.
The effectiveness of the swine flu vaccine is difficult to measure as the virus did not spread beyond Fort Dix. However, a study found that people who received the vaccine had a stronger immune response to the virus than those who did not. The authors also highlight other factors that could explain this, such as immunity from an earlier swine flu infection.
A review indicates that the vaccine effectively prevented swine flu. All medicines can have side effects, including vaccines. Some common side effects for flu vaccinations may include :. In rare cases, the vaccine can cause more serious side effects that require medical attention, such as:. Influenza is seasonal because it becomes more common in the winter months but can still occur at any time of the year.
There are many types of influenza, and they change each year. Influenza A and B viruses are typically responsible for causing seasonal epidemics of disease, known as the flu season.
To prevent influenza, scientists must predict the strains likely to be most common each year. These target groups included pregnant women, people who live with or care for children younger than 6 months of age, health care and emergency medical services personnel, anyone 6 months through 24 years of age, and people ages of 25 through 64 years of age at higher risk for H1N1 influenza because of certain chronic health conditions or compromised immune systems.
ACIP recognized the need to assess supply and demand issues at the local level. The committee further recommended that once the demand for vaccine for these target groups had been met at the local level, programs and providers should begin vaccinating everyone from ages 25 through 64 years.
Studies at that time indicated that the risk for infection among people 65 and older was less than the risk for younger age groups so people 65 and older were not initially targeted to receive early doses of vaccine.
However, ACIP noted that as vaccine supply increased and demand for vaccine among younger age groups is being met, programs and providers should also offer vaccination to people over the age of At this time, many states have already opened up vaccination to anyone who wants it and while people 65 and older are still less likely to get sick with H1N1, severe infections and deaths have occurred in every age group, including older people.
CDC is now encouraging those who have been patiently waiting to receive the H1N1 vaccine, including people 65 and older, to get vaccinated depending on local supply. The U. Food and Drug Administration FDA has approved the use of one dose of vaccine against H1N1 influenza virus for persons 10 years of age and older.
For children who are 6 months through 9 years of age, two doses of the vaccine are recommended. These two doses should be separated by 4 weeks. Infants younger than 6 months of age are too young to get any influenza vaccine. The recommendation that children younger than 10 years old receive 2 doses of H1N1 vaccine was based on studies of immune response to the vaccine as measured by levels of protective antibodies in the blood.
After 1 dose of vaccine, infants and young children do not make as many antibodies compared with older children and adults who get 1 dose. In addition, effectiveness of seasonal flu vaccine is much less for young children who have never been vaccinated before and only get 1 dose, compared with young children who have never been vaccinated before and get 2 doses. Persons who have some antibody from previous vaccination or exposure to infection with another related flu strain will have much greater increases in antibody to flu vaccines.
Studies that looked at blood samples taken from children before the pandemic indicate that very few children had any measurable immunity against H1N1 prior to the outbreak Therefore, all children younger than 10 should get 2 doses regardless of whether they ever have been given seasonal influenza vaccine. CDC recommends that the two doses of vaccine against H1N1 influenza virus be separated by 4 weeks.
However, if the second dose is separated from the first dose by at least 21 days, the second dose can be considered valid. People who are allergic to eggs might be at risk for allergic reactions from receiving any influenza vaccine. People who have had any of the following symptoms or experiences should consult with a doctor or other medical professional before considering any influenza vaccination:. Because children with severe asthma are at high risk of serious complications from influenza, a regimen has been developed for giving influenza vaccine to children with severe asthma and egg hypersensitivity.
So far this flu season, most flu activity has been caused by the H1N1 virus, which was first identified in April and caused the first flu pandemic in 40 years. Because many people with influenza illness are not tested for flu or are tested late in their illness, methods have been developed to estimate the numbers of people with influenza illness and with influenza-related complications, including hospitalizations and deaths. CDC estimates that from April to January 16, , approximately 57 million cases of H1N1 occurred in the United States, including , H1N1-related hospitalizations and about 11, deaths.
This data confirms that the H1N1 impacted younger adults and children more than older adults compared to seasonal flu. However, people in all age groups can develop severe illness from either seasonal flu or from H1N1.
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