The New York Times reports that a new study suggests that environmental conditions in the womb and shortly after birth are the main factor in the development of autism. Researchers compared 202 sets of identical and fraternal twins, where at least one sibling was diagnosed with classical autism. They found that genetic factors are responsible for 38% of cases in the study, while environmental factors are responsible for 58% of cases.
It seems to me that this study deals a blow to those who believe vaccines cause autism. After all, it concludes that the two main causes of autism are environmental and genetic. Chemicals fetuses are exposed to in the womb are much more likely to cause autism than anything in vaccines.
Showing posts with label Vaccines. Show all posts
Showing posts with label Vaccines. Show all posts
Tuesday, July 05, 2011
Tuesday, September 09, 2008
MMR-Autism Link Debunked
Today's New York Times editorial:
Ten years ago, a clinical research paper triggered widespread and persistent fears that a combined vaccine that prevents measles, mumps and rubella — the so-called MMR vaccine — causes autism in young children. That theory has been soundly refuted by a variety of other research over the years, and now a new study that tried to replicate the original study has provided further evidence that it was a false alarm.
The initial paper, published in The Lancet, the prestigious British medical journal, drew an inferential link between the vaccine, the gastrointestinal problems found in many autistic children and autism. In later papers, researchers theorized that the measles part of the vaccine caused inflammation in the gastrointestinal tract that allowed toxins to enter the body and damage the central nervous system, causing autism.
Now, a team of researchers from Columbia University, Massachusetts General Hospital and the Centers for Disease Control and Prevention has tried and failed to replicate the earlier findings.
These researchers studied a group of 38 children with gastrointestinal problems, of whom 25 were autistic and 13 were not. All had received the vaccine for measles, mumps and rubella. The scientists found no evidence that it had caused harm. Only 5 of the 25 autistic children had been vaccinated before they developed gastrointestinal problems — and subsequently autism. Genetic tests found remnants of the measles virus in only two children, one of whom was autistic, the other not.
The new study adds weight to a growing body of epidemiological studies and reviews that have debunked the notion that childhood vaccines cause autism. The Institute of Medicine of the National Academy of Sciences, the C.D.C. and the World Health Organization have found no evidence of a causal link between vaccines and autism.
Meanwhile, the original paper’s publisher — The Lancet — complained in 2004 that the lead author had concealed a conflict of interest. Ten of his co-authors retracted the paper’s implication that the vaccine might be linked to autism. Three of the authors are now defending themselves before a fitness-to-practice panel in London on charges related to their autism research.
Sadly, even after all of this, many parents of autistic children still blame the vaccine. The big losers in this debate are the children who are not being vaccinated because of parental fears and are at risk of contracting serious — sometimes fatal — diseases.
Ten years ago, a clinical research paper triggered widespread and persistent fears that a combined vaccine that prevents measles, mumps and rubella — the so-called MMR vaccine — causes autism in young children. That theory has been soundly refuted by a variety of other research over the years, and now a new study that tried to replicate the original study has provided further evidence that it was a false alarm.
The initial paper, published in The Lancet, the prestigious British medical journal, drew an inferential link between the vaccine, the gastrointestinal problems found in many autistic children and autism. In later papers, researchers theorized that the measles part of the vaccine caused inflammation in the gastrointestinal tract that allowed toxins to enter the body and damage the central nervous system, causing autism.
Now, a team of researchers from Columbia University, Massachusetts General Hospital and the Centers for Disease Control and Prevention has tried and failed to replicate the earlier findings.
These researchers studied a group of 38 children with gastrointestinal problems, of whom 25 were autistic and 13 were not. All had received the vaccine for measles, mumps and rubella. The scientists found no evidence that it had caused harm. Only 5 of the 25 autistic children had been vaccinated before they developed gastrointestinal problems — and subsequently autism. Genetic tests found remnants of the measles virus in only two children, one of whom was autistic, the other not.
The new study adds weight to a growing body of epidemiological studies and reviews that have debunked the notion that childhood vaccines cause autism. The Institute of Medicine of the National Academy of Sciences, the C.D.C. and the World Health Organization have found no evidence of a causal link between vaccines and autism.
Meanwhile, the original paper’s publisher — The Lancet — complained in 2004 that the lead author had concealed a conflict of interest. Ten of his co-authors retracted the paper’s implication that the vaccine might be linked to autism. Three of the authors are now defending themselves before a fitness-to-practice panel in London on charges related to their autism research.
Sadly, even after all of this, many parents of autistic children still blame the vaccine. The big losers in this debate are the children who are not being vaccinated because of parental fears and are at risk of contracting serious — sometimes fatal — diseases.
Tuesday, June 19, 2007
Vaccines and Sudanese Refugees
When my niece was born, my sister decided not to vaccinate her against certain diseases, fearing that vaccines had something to do with my nephew's autism. "Everybody else is vaccinated anyway, so there's nobody who can get her sick", was her main argument then, when she tried to convince me (and probably herself) that the risks of vaccination are greater than the risks of non-vaccination.
For the past few years a small yet steady stream of African refugees, mostly from Sudan (Darfur and South Sudan), has been crossing the border into Israel. Their numbers have recently risen and their plight has gotten more press coverage. While in the past they were arrested and deported, government policy now allows them to stay in Israel, but they do not have any legal status here. Most of them don't even receive refugee status, and the government doesn't lift a finger to help them. They've been pretty much stranded. Some Kibbutzim have taken some of them in, others have been given jobs in Eilat, but even those are only temporary solutions.
I thought of pitching in somehow to help them, maybe by volunteering at a Kibbutz where they are staying or something of the sort. But then I realized that there may be health implications. Even if I am vaccinated against most diseases they may have, I can still become a carrier and pose a health risk to my niece. Then I thought of the fact that not only can I become a risk factor, a lot of people who either come into contact with the refugees or with others who have been in contact with them, may pose a health threat to my niece and any other child who was not vaccinated.
I should talk to my sister about this. It isn't too late to give my niece the vaccines she hasn't taken yet. Now, with the current situation, my sister may be convinced that the risks of not being vaccinated outweigh the perceived menace of mercury.
And an apology to the refugees if this post makes them sound like little more than carriers of dangerous diseases. I still plan to help them.
For the past few years a small yet steady stream of African refugees, mostly from Sudan (Darfur and South Sudan), has been crossing the border into Israel. Their numbers have recently risen and their plight has gotten more press coverage. While in the past they were arrested and deported, government policy now allows them to stay in Israel, but they do not have any legal status here. Most of them don't even receive refugee status, and the government doesn't lift a finger to help them. They've been pretty much stranded. Some Kibbutzim have taken some of them in, others have been given jobs in Eilat, but even those are only temporary solutions.
I thought of pitching in somehow to help them, maybe by volunteering at a Kibbutz where they are staying or something of the sort. But then I realized that there may be health implications. Even if I am vaccinated against most diseases they may have, I can still become a carrier and pose a health risk to my niece. Then I thought of the fact that not only can I become a risk factor, a lot of people who either come into contact with the refugees or with others who have been in contact with them, may pose a health threat to my niece and any other child who was not vaccinated.
I should talk to my sister about this. It isn't too late to give my niece the vaccines she hasn't taken yet. Now, with the current situation, my sister may be convinced that the risks of not being vaccinated outweigh the perceived menace of mercury.
And an apology to the refugees if this post makes them sound like little more than carriers of dangerous diseases. I still plan to help them.
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