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If you get dengue fever once, are you protected from subsequent infection?

Not necessarily!

There are several serotypes. The fifth serotype was discovered in 2013.

"While they are all closely related to each other, infection with one serotype only offers limited and temporary immunity against other serotypes. In fact, multiple infections with different types of dengue increase the risk of severe dengue infections such as dengue hemorrhagic fever and dengue shock syndrome. - See more at: http://healthmap.org/site/diseasedaily/article/fifth-dengue-serotype-discovered-102513#sthash.2hf8yqoI.dpuf"

 If you had the first infection with DENV-1 and later got the second infection with DENV-2, the antibodies you generate will bind to the virus DENV-2 but cannot prevent infection.

 Dengue can be extremely debilitating. There is no vaccine or cure for dengue at this time.

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