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A pair of studies published last week focused on Zika’s complex relationship with dengue, which is closely related and spread by the same Aedes mosquito as Zika.

In paper published in Nature Immunology on Thursday, researchers found that most dengue antibodies helped Zika viruses proliferate and invade cells.

That suggests that people previously infected with dengue, whose antibodies against dengue remain in their blood, might have a more severe reaction to Zika, according to Gavin Screaton, chair of medicine at Imperial College London.

But although these results support similar findings from United States researchers, not everyone is convinced that past dengue infections can make Zika cases more severe.
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