Why Can Mosquitoes Transmit Zika, But Not the Flu?

Mosquitoes transmit a number of terrible diseases like malaria, West Nile virus, and the Zika virus, but why not the flu?

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Sources:
http://cmr.asm.org/content/18/4/608.full
https://www.niaid.nih.gov/topics/Malaria/Pages/lifecycle.aspx
http://www.who.int/features/qa/10/en/
http://www.mosquito.org/mosquito-borne-diseases
http://www.cdc.gov/zika/about/index.html