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The fact that this normally happens only when more water is added to a container increases the probability that a container will have enough water for the larvae to complete their development before the container dries out.While male mosquitoes feed only on plant juices, females suck blood from animals to get the nutrients they need to develop their eggs.

It is not caused by a separate viral strain; instead, it comes from the fact that the dengue virus has four distinct strains.The mosquito lays her eggs on the side of a container a few millimetres above the water level.The eggs can sit for months without hatching if they remain dry, but they hatch within minutes if covered with water.These examples show the rewards of paying attention to both ecological and social considerations in a balanced manner when dealing with environmental problems.Effective and enduring solutions to environmental problems cannot be expected when solutions focus only on political and economic considerations to the exclusion of ecological realities, or when they focus solely on ecological considerations to the exclusion of social realities.The historical record for dengue is not clear because its symptoms do not distinguish it from other diseases, but dengue was probably common throughout much of the Americas for centuries. Dengue fever was common in towns and cities on the Gulf and Atlantic coasts of the United States until the 1930s.

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