There's an unusual factory in Curitiba, Brazil. It's producing mosquitos by the millions, all to combat the diseases these insects spread.

That's because the mosquitos produced here can't spread infections like dengue, zika and chikungunya.

So, what does it take to raise an army of virus fighting mosquitos?

Update: This video has been updated upon request by Wolbito do Brasil to remove glimpses of proprietary technology in the factory.

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