Re: Bt pesticides, archive 2302
- To: "Rick Roush" <email@example.com>
- Subject: Re: Bt pesticides, archive 2302
- From: "Dorothy Bowes" <firstname.lastname@example.org>
- Date: Wed, 8 Dec 1999 09:00:09 +1100
- Cc: <email@example.com>
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SAVE THE FARMERS - STUFF THE
Putting Bt in food does not necessarily compensate by sparing
farmers the Bt spray. If Bt is expressed in the food it may be simply
taking the problem from the farmers and putting it on the consuming
public. Yeah, great thinking Rick. I don't think this is good
science. I shall continue to look for more studies before I make an
informed comment and you can look forward to further comment then.
Only long term human feeding studies are acceptable as risk
assessment. In the meantime I support a moratorium on Bt crops as a
safeguard for both the environment and human health - what happened to the
For the record, I don't support the use of Bt in organic
Another (minor) reason to
use Bt crops that produce only one Bt protein rather than continue to expose
farm workers to a Bt spray in which there are thousands of bacterial
proteins, some of which are bound to have allergenic potential.
Health risks of Bt pesticide
Claims of health
risks to Bt pesticides have been minimal, but this may be due to lack of
health data as the potential allergenicity of these organisms has not
been evaluated. To address the lack of data a health survey was
conducted in farm workers before and after exposure to Bt pesticides.
The workers were evaluated before the spraying and one and four months
after the spraying. Two groups of low and medium exposure workers were
also assessed. While there was no evidence of occupationally related
respiratory disease, positive skin prick tests were seen in exposed
workers with a significant increase in the number of positive tests to
spores 1 to 4 months after exposure to Bt spray. The increase was more
significant in high rather than low exposure workers. The study
concluded that exposure to Bt sprays may lead to allergic skin
sensitisation and induction of IgE antibodies or IgG antibodies - or
- Bernstein J L et al. 1999. Immune responses in farm
workers after exposure to Bacillus thuringiensis pesticides.
Environmental Health Perspectives. 107 (7):