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Gravid Traps

The gravid trap uses hay infused (stinky) water to attract gravid (pregnant) blood-fed mosquitoes.  These traps are set out at the same time and in close proximity to the EVS trap sites.  Gravid traps are also important in collecting mosquitoes for virus testing, because the blood-fed mosquitoes are more likely to contain virus.  The mosquitoes are also sent to CDPH for testing.