With the pandemic outbreak of the H1N1 virus, more and more companies are requesting for flu vaccination as part of their wellness programs. I never had a flu shot so I don't have any idea of its effectivity. I know for a fact though that the vaccine only protects for a certain number of influenza virus strain. Here's an article I encountered which gives some light about flu vaccines.
What is the flu vaccine? The flu vaccine is prepared from the fluids of chick embryos inoculated with a specific type(s) of influenza virus. The strains of flu virus in the vaccine are inactivated with formaldehyde and preserved with thimerosal, which is a mercury derivative.
Does the flu vaccine protect against all throat, respiratory, gastrointestinal and ear infections? The flu vaccine only protects against the three specific viral strains which are included in any given year's flu vaccine. Throat, respiratory, gastrointestinal and ear infections caused by bacteria or other kinds of viruses are not prevented by getting an annual flu shot.
Why do doctors say I have to get a flu vaccine every year? Like all vaccines, the flu vaccine only gives a temporary immunity to the virus strains or closely related virus strains contained in the vaccine. The only way to get natural and permanent immunity to a strain of flu is to recover naturally from the flu. Natural immunity to a particular strain of flu can be protective if that strain or closely related strains come around again in the future. However, because the vaccine only provides a 70 to 80 percent chance of temporary immunity to selected strains and those strains may or may not be prevalent each year, doctors say you have to get a flu shot every year.
Are there reactions to the flu vaccine? The most common reactions, which begin with 12 hours of vaccination and can last several days are: fever, fatigue, painful joints and headache. The most serious reaction that has been associated with flu vaccine is Guillain-Barre Syndrome (GBS) which occurs most often within two to four weeks of vaccination. GBS is an immune mediated nerve disorder characterized by muscle weakness, unsteady gait, numbness, tingling, pain and sometimes paralysis of one or more limbs or the face. Recovery lasts several months and can include residual disability. Less than 5 percent of GBS cases end in death.
What are contraindications to the flu vaccine? Among high risk factors listed by the CDC and the vaccine manufacturers are anyone who: (1) is sick with a fever; (2) has an impaired immune system; (2) has an egg allergy; (3) has a mercury allergy; (4) has a history of Guillain-Barre syndrome. In years past, pregnancy was also a contraindication to flu vaccine but, today, the Advisory Committee on Immunization Practices (ACIP) of the Centers for Disease Control (CDC) recommends flu vaccine for women more than 14 weeks pregnant.
The package inserts published by the flu vaccine manufacturers state that "Animal reproduction studies have not been conducted with influenza virus vaccine. It is also not known whether influenza virus vaccine can cause fetal harm when administered to a pregnant woman... Although animal reproductive studies have not been conducted, the prescribing health care provider should be aware of the recommendations of the Advisory Committee on Immunization Practices .The ACIP states that if used during pregnancy, administration of influenza virus vaccine after 14 weeks of gestation may be preferable to avoid coincidental association of the vaccine with early pregnancy loss."
Is Flu Vaccine Recommended for Children? The flu vaccine has never been recommended for healthy children. However, in the past few years there have been indications that health officials are soon going to recommend flu vaccine for all children. A nasal flu vaccine is scheduled to be on the market in late 2000 and publicity promoting this vaccine has centered on its potential use in children.
The current injectable flu vaccine contains mercury as a preservative. In the summer of 1999, the FDA, CDC and EPA directed the vaccine manufacturers to remove mercury as a preservative in childhood vaccines. Mercury is a known neuro-toxin and American babies under six months of age are currently exposed to mercury in childhood vaccines that exceed EPA safety standards.
One consideration with the mass use of flu vaccine in healthy children is the removal of natural antibodies to flu which are obtained from natural infection. The question of whether it is better for healthy children, who rarely suffer complications from flu, to get the flu and develop permanent immunity to that flu strain or it is better for children to get vaccinated every year to try to suppress all flu infection in early childhood is a question that has yet to be adequately answered by medical science.
Why do doctors say I have to get a flu vaccine every year? Like all vaccines, the flu vaccine only gives a temporary immunity to the virus strains or closely related virus strains contained in the vaccine. The only way to get natural and permanent immunity to a strain of flu is to recover naturally from the flu. Natural immunity to a particular strain of flu can be protective if that strain or closely related strains come around again in the future. However, because the vaccine only provides a 70 to 80 percent chance of temporary immunity to selected strains and those strains may or may not be prevalent each year, doctors say you have to get a flu shot every year.
Are there reactions to the flu vaccine? The most common reactions, which begin with 12 hours of vaccination and can last several days are: fever, fatigue, painful joints and headache. The most serious reaction that has been associated with flu vaccine is Guillain-Barre Syndrome (GBS) which occurs most often within two to four weeks of vaccination. GBS is an immune mediated nerve disorder characterized by muscle weakness, unsteady gait, numbness, tingling, pain and sometimes paralysis of one or more limbs or the face. Recovery lasts several months and can include residual disability. Less than 5 percent of GBS cases end in death.
What are contraindications to the flu vaccine? Among high risk factors listed by the CDC and the vaccine manufacturers are anyone who: (1) is sick with a fever; (2) has an impaired immune system; (2) has an egg allergy; (3) has a mercury allergy; (4) has a history of Guillain-Barre syndrome. In years past, pregnancy was also a contraindication to flu vaccine but, today, the Advisory Committee on Immunization Practices (ACIP) of the Centers for Disease Control (CDC) recommends flu vaccine for women more than 14 weeks pregnant.
The package inserts published by the flu vaccine manufacturers state that "Animal reproduction studies have not been conducted with influenza virus vaccine. It is also not known whether influenza virus vaccine can cause fetal harm when administered to a pregnant woman... Although animal reproductive studies have not been conducted, the prescribing health care provider should be aware of the recommendations of the Advisory Committee on Immunization Practices .The ACIP states that if used during pregnancy, administration of influenza virus vaccine after 14 weeks of gestation may be preferable to avoid coincidental association of the vaccine with early pregnancy loss."
Is Flu Vaccine Recommended for Children? The flu vaccine has never been recommended for healthy children. However, in the past few years there have been indications that health officials are soon going to recommend flu vaccine for all children. A nasal flu vaccine is scheduled to be on the market in late 2000 and publicity promoting this vaccine has centered on its potential use in children.
The current injectable flu vaccine contains mercury as a preservative. In the summer of 1999, the FDA, CDC and EPA directed the vaccine manufacturers to remove mercury as a preservative in childhood vaccines. Mercury is a known neuro-toxin and American babies under six months of age are currently exposed to mercury in childhood vaccines that exceed EPA safety standards.
One consideration with the mass use of flu vaccine in healthy children is the removal of natural antibodies to flu which are obtained from natural infection. The question of whether it is better for healthy children, who rarely suffer complications from flu, to get the flu and develop permanent immunity to that flu strain or it is better for children to get vaccinated every year to try to suppress all flu infection in early childhood is a question that has yet to be adequately answered by medical science.
Resource: National Vaccine Information Center
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