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[e-med] (3) de l'usage des moustiquaires imprégnées...

la seule conséquence appréciable est que le nombre d'infections à P. 
falciparum dimminue proportionnellement à celle de P. vivax chez les 
moustiques
mais globalement il semble que le nombre d'infections des moustiques 
dimminue
l'étude concerene l'infection des moustiques pas des sujets

Dr Jean Loup REY
Quartier Le Barry
F. 04180 Villeneuve

(33) 04 92 78 54 60
(33) O6 16 53 83 30

jean-loup.rey@wanadoo.fr

----- Original Message ----- 
From: "Vincent Nkong-Njock" <V.Nkong-Njock@iaea.org>
To: <e-med@healthnet.org>
Sent: Friday, March 03, 2006 10:00 AM
Subject: [e-med] (2) de l'usage des moustiquaires imprégnées...


Cher Jean-Loup,

Quelles en sont les conséquences ?
Pouvez-vous nous expliquer l'impact de la contamination par P. vivax 
comparativement a celle par P. falciparum.

Vincent Nkong-Njock
AIEA

_______________________________________________
----- Message d'origine ----- 
De : "jean-loup.rey" <jean-loup.rey@wanadoo.fr>
À : "e-med e-med" <e-med@healthnet.org>
Envoyé : jeudi 2 mars 2006 20:40
Objet : [e-med] de l'usage des moustiquaires imprégnées...


Cet article montre que à partir de l'analyse des taux d'infection des
moustiques vecteurs l'utilisation des moustiquaires imprégnées modifie
l'infection de ces moustiques en faveur de P. vivax aux dépens de P.
falciparum
d'autre part l'étude a permis de montrer que les moustiques qui piquent
avant 22 heures sont plus souvent infectés par P. vivax que par P.
falciparum
au total l'utilisation de ces moustiquaires a diminué la contamination des
populations utilisatrices par P. falciparum et augmenter la contamination
par P. vivax.

Dr Jean Loup REY
Quartier Le Barry
F. 04180 Villeneuve

(33) 04 92 78 54 60
(33) O6 16 53 83 30

jean-loup.rey@wanadoo.fr

----- Original Message ----- 

> Are insecticide-treated bednets more protective against Plasmodium
> falciparum than Plasmodium vivax-infected mosquitoes ?
> Moses J Bockarie  and Henry Dagoro
>
> Malaria Journal 2006, 5:15     doi:10.1186/1475-2875-5-15
> http://www.malariajournal.com/content/5/1/15
>      Published   21 February 2006
>
>
> Abstract (provisional)
>
>
>
> Background
>
> The outcomes of insecticide-treated bednet (ITN) interventions for malaria
> control in Papua New Guinea (PNG)tend to suggest a differential protective
> effect against Plasmodium falciparum and Plasmodium vivax. Little is known
> about the impact of ITNs on the relative abundance of mosquitoes infected
> with either P. falciparum or P. vivax. This paper describes the biting
> cycle of P. falciparum and P. vivax-infected mosquitoes and the impact of
> an ITN intervention on the proportion of mosquitoes infected with either
> parasite species.
>
> Methods
>
> Entomological investigations were performed in East Sepik (ESP) and New
> Ireland Provinces (NIP) of PNG. Mosquitoes were collected using the
> all-night (18:00 - 06:00) landing catch and CDC light-trap methods and
> species specific malaria sporozoite rates were determined by ELISA.
>
> Results and discussion
>
> The distribution of sporozoite positive mosquitoes in three four-hour
> periods (18:00-22:00, 22:00-02:00 & 02:00-06:00) showed that a higher
> proportion of P. vivax-infected mosquitoes were biting before people
> retired to bed under the protection of bednets. In the intervention
> village, the 308 mosquitoes collected before ITNs were introduced included
> eight (2.0%) P. falciparum-positive and four (1.0%) P. vivax-positive
> specimens, giving a parasite ratio of 2:1. The sporozoite rate determined
> from 908 mosquitoes caught after ITNs were introduced showed a significant
> decrease for P. falciparum (0.7%) and a slight increase for P. vivax
> (1.3%), resulting in a post intervention parasite ratio of 1:2. In the
> East Sepik Province, where ITNs were not used, P. falciparum remained the
> dominant species in 12 monthly mosquito collections and monthly P.
> falciparum:P. vivax formula varied from 8:1 to 1.2:1.
>
> Conclusion
>
> These findings suggest that people sleeping under treated bednets may be
> more exposed to P. vivax than P. falciparum-infected mosquitoes before
> going to sleep under the protection of bednets. This difference in the
> biting behaviour of mosquitoes infected with different malaria parasites
> may partly explain the change in the P. falciparum:P. vivax formula after
> the introduction of ITNs.


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