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This is cool. Though, do they spread dengue fever or chikungunya?

No, but nor will they help against Dengue.

Actually, I'm not sure about chikungunya, but Malaria and Dengue is carried by different species of mosquitoes. I think chikungunya is carried by the same species as Dengue, but I'm not sure if that is exclusive to that species.

Not exclusively, but indeed the two main vectors for both dengue and chikungunya are Aedes aegypti and aedes albopictus. Several other species are at least somewhat capable of transmitting these viruses.

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