News from Olavarria, Province of Buenos Aires Argentina

News from Olavarria, Province of Buenos Aires Argentina

Dr. Darío Vezzani, biologist and researcher at CONICET at the UNICEN Institute of Ecosystems, visited the Municipal Hospital “Dr. Héctor Cura” a few days ago to carry out work on the prevention of the mosquito vector of dengue , as well as zoonoses and maintenance. Vezzani has been working for more than a year with the team from the Department of Food Sciences and points out that among the 250 species of mosquitoes in Argentina, only one is the one that transmits dengue fever in the province of Buenos Aires, and it is called Aedes. aegypti. . This viral disease is characterized by fever accompanied by pain behind the eyes, head, muscles and joints; nausea and vomiting; severe fatigue; appearance of spots on the skin; and itchy and/or bleeding nose and gums.

The Aedes aegypti mosquito is born without the virus, but when it bites a person with dengue, it acquires it and a few days later can transmit it to other people. Thus, not all individuals of this species transmit the disease, only those who have already bitten a sick person.

This mosquito is an urban and domestic insect, unlike most other species, it finds inside our homes, patios and gardens all the necessary conditions to grow, this means that it uses artificial containers of all kinds (buckets, cans, jars, used tires, fountains, etc.) for the development of their larval stages, which are aquatic.

In addition, it places its eggs individually on the interior walls of the containers, a few millimeters above the water, and when the container is replenished with water, the eggs are submerged and hatch. From there, the development of the larvae begins and a few days later the flying adults will emerge, and only the females will be the ones sucking blood. We will never find this mosquito in lagoons, lakes, streams, puddles or ditches.

Aedes aegypti has been spreading in Argentina since its reintroduction in the north of the country in 1986. During the 1990s, it reached Greater Buenos Aires and then continued a slow but constant dispersal towards the center and south of the territory of Buenos Aires. Areas. Currently, Bahía Blanca is the city of Buenos Aires with the southernmost record.

Like the mosquito, dengue fever is also progressing on our territory, both in intensity and in geographical extension. The number of dengue transmission localities tripled from 167 during the first national epidemic (in 2009 with 27,000 cases) to 496 localities during the most recent (in 2020 with 60,000 cases).

Associated with the increase in positive localities and the number of cases, there is a shift in the limit of dengue transmission to the south, from the suburbs of Buenos Aires to Saladillo in the center of the province, less than 200 km from the city. From the region they indicated that in Olavarría the transmission of dengue has not been demonstrated until today, but the arrival of people with symptoms of dengue from other regions has finally been detected.

The presence of Aedes aegypti has been known in the city for about 10 years. During the summer-fall of 2022, the Department of Food Science initiated mosquito monitoring activities during the warm months.

For this, traps detecting the laying of eggs of this species (ovitraps) were used, which made it possible to demonstrate their presence in different areas of the city. We now know for sure that the mosquito is well established in the city. In large green spaces and walkways, other species of mosquitoes are responsible for the bites.

A few days ago, a training session was held for the maintenance staff of the Hospital, it was a sort of prevention session where they were explained to them within the premises which were the places where the mosquito dengue could recur.

The main objective was to search for possible breeding sites. “We walked around the property with the maintenance people, noted a few minor issues that are very easy to fix, and then we’re going to give them a written report so they have this tool to work within. hospital,” Vezzani noted. in an interview with Noticias on Local Channel.


Fumigation is only recommended in the event of an epidemic, that is to say to eliminate adult mosquitoes carrying the virus and to stop the transmission of dengue fever. It is expensive and ineffective because it only kills adult mosquitoes; the next day there will be new mosquitoes.

Moreover, it is bad for the environment because it also kills beneficial insects; A clear example are bees. We can assure you that it is also bad for people; otherwise, they would not use coveralls, masks and gloves for their application. And worse, it produces resistance in mosquito populations. This means that the mosquitoes that survive will later leave offspring that are not susceptible to this insecticide, and we will have lost the tool we have to control them in an epidemic situation.

When in the cities of Buenos Aires we end up suffering a swarm of mosquitoes that bite us in green spaces and walks, we must understand that this has nothing to do with the dengue mosquito. These are other species of mosquitoes that suddenly proliferate in puddles due to heavy rain followed by heat. We have to understand that asking the authorities to fumigate us, that is to spray us with poisons, makes no sense.

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