Por que dengue dá coceira?

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Manchas avermelhadas e coceira são alguns dos sintomas finais da dengue, quando a doença está quase deixando o organismo.

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O quadro decorre de uma substância produzida pelo corpo e que atua no sistema imunológico, regulando as reações químicas no combate a alergias e inflamações: a histamina.

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No ciclo final da dengue no organismo, o corpo libera “mediadores inflamatórios” para eliminar o vírus, o que ocasiona irritação nas terminações nervosas e no tecido cutâneo. Este processo resulta na coceira.

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[{"selector":"#anim-0e041dc7-3140-494e-bbd2-0d45910cb26d","keyframes":{"opacity":[0,1]},"delay":100,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-413ed905-ea67-43db-814b-968c6f4de023","keyframes":{"transform":["translate3d(115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d396f814-1518-4102-8db4-642b117ab787","keyframes":{"opacity":[0,1]},"delay":150,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-9a1a1316-290a-486a-b6c7-2f158280b320","keyframes":{"transform":["translate3d(115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":150,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f89c6c40-811a-4ef3-85c5-c95970878143","keyframes":{"opacity":[0,1]},"delay":200,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-13b6346a-df38-4e85-8a29-f69672a13d5b","keyframes":{"transform":["translate3d(115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":200,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b723ad66-7957-484c-9555-e5e340bd8697","keyframes":{"transform":["scale(1)","scale(1.2)","scale(0.98)","scale(1)"],"offset":[0,0.33,0.66,1]},"delay":0,"duration":600,"easing":"ease-in-out","fill":"both","iterations":1}] [{"selector":"#anim-9028a8cf-b9cc-4bc8-be8e-dee0a1637b16","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e6ba1b8c-00fe-46f3-a483-e8aa050419bd","keyframes":{"transform":["translate3d(0px, -99.18984%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Quando já está começando o processo de eliminação do vírus, mas ainda tem uma cascata inflamatória que é muito importante na dengue, esse efeito dos anticorpos ainda inflamando o corpo, vai levar a essa liberação de citocinas. Cezar Riche Cezar Riche Infectologista do Hospital Mãe de Deus

É o vírus da dengue o responsável por induzir o nosso organismo a liberar as substâncias. No entanto, ainda não se sabe o que leva o corpo a este comportamento. O sintoma não é registrado em todos os casos.

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[{"selector":"#anim-4712d249-dcde-4799-b414-cf4e171fa9a8","keyframes":{"opacity":[0,1]},"delay":100,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-78a74c5e-a239-4d5b-94c0-a095ec8e4d2e","keyframes":{"transform":["translate3d(115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-227c62be-d271-44ff-b586-6960268e82fb","keyframes":{"opacity":[0,1]},"delay":150,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-cc6a3172-c252-4fae-8be1-2e3b1d914515","keyframes":{"transform":["translate3d(115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":150,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7cf8475e-4d03-4f5a-a29a-d97e2910340b","keyframes":{"opacity":[0,1]},"delay":200,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a3bb10cb-8fad-4a4c-ae04-0d1667e7e793","keyframes":{"transform":["translate3d(115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":200,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-111cf237-3402-4dff-97a3-7f03c7c9016e","keyframes":{"transform":["scale(1)","scale(1.2)","scale(0.98)","scale(1)"],"offset":[0,0.33,0.66,1]},"delay":0,"duration":600,"easing":"ease-in-out","fill":"both","iterations":1}] [{"selector":"#anim-73a278c2-9ea5-4c59-9552-99e49777e17e","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e5624aa4-de2a-401b-8d88-a4f70afa730f","keyframes":{"transform":["translate3d(0px, -99.18984%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] A histamina é uma substância que causa bastante coceira. Não se sabem bem ao certo o motivo, mas o vírus, nesta fase final, faz com que as células do sistema imunológico liberem essa substância. Não são todos os vírus que causam isso . Paulo Gewehr Paulo Gewehr Infectologista e pesquisador do Centro de Pesquisa do Hospital Mãe de Deus

A coceira e as manchas avermelhadas tendem a durar entre 36 e 48 horas, geralmente. O incômodo costuma ser mais característico na palma das mãos, na sola dos pés e no rosto.

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Como aliviar a coceira?

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Acompanhe as últimas notícias em GZH

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