Re: [escepticos] DDT y sentido común

[Ramon Diaz-Alersi]

El día 15/09/06, Pedro J Hernández González <
pedroj.hernandezgonzalez en gobiernodecanarias.org> escribió:
>
> El tema salió varias veces en la lista y personalmente quedé bastante
> convencido de que los efectos nocivos del DDT son francamente
> discutibles como para obviar sus efectos beneficiosos. Ahora parece que
> algunos empiezan a planterselo
>
> http://news.bbc.co.uk/2/hi/science/nature/5350068.stm
>
> Pues no sé que decirte ¿No estaremos ante otro de esos casos de que no es
bueno para nosotros, pero sí para los pobrecitos del tercer munndo? Lo digo
por este reciente artículo español:

 Am J Epidemiol. 2006 Sep 12;
In Utero Exposure to Background Concentrations of DDT and Cognitive
Functioning among Preschoolers.

* Ribas-Fito N, * Torrent M, * Carrizo D, * Munoz-Ortiz L, * Julvez J, *
Grimalt JO, * Sunyer J.

Respiratory and Environmental Health Research Unit, Institut Municipal
Investigacio Medica (IMIM), Barcelona, Catalonia, Spain.

p,p'-DDT (bis[p-chlorophenyl]-1,1,1-trichloroethane) is a persistent
organochlorine compound that has been used worldwide as an insecticide. The
authors evaluated the association of cord serum levels of DDT and its
metabolite, 2,2-bis(p-chlorophenyl)-1,1-dichloroethylene (DDE), with
neurodevelopment at age 4 years. Two birth cohorts in Ribera d'Ebre and
Menorca (Spain) were recruited between 1997 and 1999 (n = 475). Infants were
assessed at age 4 years by using the McCarthy Scales of Children's
Abilities. Organochlorine compounds were measured in cord serum. Children's
diet and parental sociodemographic information was obtained through
questionnaire. Results showed that DDT cord serum concentration at birth was
inversely associated with verbal, memory, quantitative, and
perceptual-performance skills at age 4 years. Children whose DDT
concentrations in cord serum were >0.20 ng/ml had mean decreases of
7.86(standard error,
3.21) points in the verbal scale and 10.86 (standard error, 4.33) points in
the memory scale when compared with children whose concentrations were
<0.05ng/ml. These associations were stronger among girls. Prenatal
exposure to
background, low-level concentrations of DDT was associated with a decrease
in preschoolers' cognitive skills. These results should be considered when
evaluating the risk and benefits of spraying DDT during antimalaria and
other disease-vector campaigns.

Saludos.


-- 
Ramón Díaz-Alersi
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