MEETING – According to the Institute of health wakefulness (InVS) the weekly number of cases in the illness of the chikungunya diminishes for week from 5 till 12 February 2006. The chikungunya attained 204.000 on the island of Meeting since the beginning of the epidemic, among which 3.115 cases in the course of last week of counting. However InVS adds that the data of these last two weeks are not still consolidated, this evolution must be confirmed all the more that unexpected events such as tropical depression Diwa, which affects the island since March 3rd, can contribute to change the ecology of the mosquito vector of illness.

Transmission remains very active in all arrondissements since the recrudescence of December, 2005, it was particularly intense in the east of and the southwest of the island and she stretches on the West consequently. Surveillance is based on a network of doctors sentries which allows to follow the tendencies of the epidemic at best.

Slowing down of the epidemic of chikungunya in Meeting

An estimate from a mathematical model, based on historical series, allows to assess the total number of case introducing signs compatible with an infection in chikungunya since the beginning of the epidemic (that they have or not consulted a doctor) in about 204.000 cases, among which about 13.000 cases during the week from 27 till 5 March 2006. Between March 28th, 2005 and March 5th, 2006, 3.115 cases were notified by the doctors of network sentry of the island of Meeting, among which 196 in the course of the week from 27 till 5 March 2006.

In total, since the beginning of the epidemic, 73 persons with an infection in chikungunya confirmed biologically had a clinical serious expression of illness (neurological forms, hépatiques) who required a hospitalization in intensive care. 33 infections confirmed in chikungunya were brought back to new born old of less than 28 days. The doctors signal a risk of décompensation linked to the effects of the high-pitched infection on the general state of the vulnerable persons, particularly one of the old persons, new born, of the immunodéprimées persons Since January, 2006, 125 death certificates in which the chikungunya is mentioned took a census.

Situation in Mayotte: Between January 9th and March 10th, 2006, 2.833 suspicious cases of high-pitched infection in chikungunya were brought back in Mayotte, among which 179 in the course of the week from 6 till 12 March 2006. The most part of cases are identified in Grand Mamoudzou, Small Earth and the north coast of the island. The measurements of antivector conflict were reinforced since the beginning of the year.

The virus circulated in the region southwest of Indian Ocean at the beginning of the year on 2005, with particularly infectious homes identified in Comoros, in Maurice, in Seychelles, in Meeting and in Mayotte. In the waning of the installation of the Austral winter and to the end of year 2005, Comoros, island Maurice, Seychelles and Mayotte had not identified case or then any insulated cases. Since the beginning of January, 2006, there is again a circulation of the virus Chikungunya in the region.

In Seychelles, in the date of March 1st, 2006, about 4650 cases were declared since the beginning of the year (WHO source). In Comoros, in the date of March 10th, 2006, no case was signalled, since the beginning of the year (unconfirmed source). In Madagascar, 2 cases of Chikungunya, confirmed biologically, in Toamasina (coast is from the island) were notified during week from 6 till 12 March 2006. In Maurice, in the date of March 1st, 2006, 2.553 cases were notified, among which 1.173 cases confirmed biologically (WHO source).

In India, between 1 er December, 2005 and February 17th, 2006, 5.671 cases of fevered arthralgia were brought back in in Andhra Pradesh, state from the east of the Indian Union. 139 of these cases are biologically confirmed as being an infection in Chikungunya. In the neighbouring state of Orissa, 4.904 cases of fever with myalgies and headaches were notified between February 27th and March 5th. The results of supplementary exams are in wait. Indigo is a country where the circulation of the virus Chikungunya is known.

In Meeting, epidemic being always very active and in the context of the strong rains happened at the end of last week, it is necessary to remind of importance to adopt individual behaviours which aim at protecting themselves from injections of mosquito and to contribute to the destruction of the embryonic shelters. It exists neither vaccine nor precautionary treatment against the infection in Chikungunya. The measurements of control rest therefore on efforts coupled by antivector conflict and by Community conflict to eliminate the shelters of mosquitoes.

Since the end of the Austral winter, the measurements of antivector conflict were considerably reinforced, but have to come as a supplement to the also necessary Community measurements of conflict. The whole population is concerned and must follow the daily actions of destruction of the potential shelters around houses (stagnant water in saucers, vases, buckets, refuse.)

In these conditions, the measurements of individual prevention against the injections of mosquito are very important and have to be catches in a daily manner: spray and creams, electrical distributors, streamers, long clothes and mosquito nets The pregnant women and the very young children have to make the object of adapted and particularly reinforced measurements. The mosquito vector stings the day, principally outside houses, with a more important activity at the beginning of morning and at the end of day.

The virus chikungunya is an arbovirus transmitted by a mosquito of type Aedes. It circulates especially in Eastern Africa, in Asia of the Southeast and in the Indian subcontinent.

About 4 - 7 days after the infectious injection of mosquito, a well brought up fever appears roughly. Important articular and muscular pain touching ends of the members (wrists, ankles joins it typically, phalanxes), of edemata, of headaches and, sometimes, a cutaneous eruption. Minor hemorrhages with type of épistaxis and gingivorragies can happen, especially at the children.

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