In the coming weeks the Ministry of Health and the Valencian Community plan an increase in mosquitoes in places affected by DANA. And stagnant waters favor their reproduction. However, they point out that the risk of disease transmission by this type of insects is low.
Given a probable increase, the document agreed upon by the Public Health Response Coordination Group recommends that “appropriate measures” be taken to prevent the proliferation of these insects and control their density. Also reduce the possibility of contagion of diseases.
Regarding the type of mosquito linked to the occurrence of West Nile virus infections Occidental, the department of Mónica García considers that the risk of increase is moderate-high in the next two to five weeks, but there will be a lower risk if temperatures drop. In this period of time, annoying bites have a high probability, but the health impact is very low; the probability of diseases is low with moderate impact. From the fifth week onwards, the risk of an increase in ‘Culex’ is moderate, if there are flooded areas and temperatures are mild or flooded areas in the subsoil and basements regardless of the outside temperature.
As for the mosquito ‘Aedes caspius’ and ‘Aedes vexan’, The risk of an increase in the coming weeks is high, although it will be lower if temperatures drop. The associated health risks are very annoying bites, but with a very low health impact. While there is no risk of disease transmission.
He ‘Aedes albopictus’related to the dengue, chikungunya and Zika viruses, the risk of increase in the vector is moderate-high, although the risk is lower if temperatures drop. Regarding the associated health risks: these are annoying bites with a very low impact on health. The probability of diseases (denguezika-chikungunya) is low due to the low season of travel to endemic areas with low impact, although, starting from the fifth week, this probability becomes moderate.
On the other hand, sandflies and ticks They are also vectors that may increase in the coming weeks. In the case of sandflies, the increase and risk of diseases is low in the coming weeks, although, from the fifth week onwards, the risk of increase in the vector becomes moderate (if the presence of decomposing organic waste continues). . The health risks associated with moderate probability of ‘Leishmaniasis’ have a low health impact and of Toscana virus meningoencephalitis have a moderate impact.
Regarding ticks, the current risk of increase is low, although, after the fifth week, the risk of increase becomes moderate. Regarding the associated health risks, the probability of ‘rickettsiosis’ and ‘borreliosis’ is low and with a low impact on health.
Immediate action
The Ministry of Health recommends establish preferential areas of actionfrom the most affected areas to more external territories, taking into account especially the new water bodies and the pre-existing affected ones. Thus, to prevent the proliferation of all vectors, it recommends cleaning and evacuation of all stagnant water: accumulation of sludge, sludge and organic matter away from urban centers.
To reduce the proliferation of mosquitoes, it recommends immediate action given the emergency situation. In this sense, it is advisable to carry out preventive treatments, preferably larvicides, in the most affected areas. Ideally, he points out, there should be periodic inspection (weekly or biweekly) of the areas and if larvae are found, larvicides should be applied.
García’s department advises applying larvicidal and adulticidal treatments in the peripheral areas of urban centers if there is discomfort from bites or an increase in mosquito densities is detected.
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