what to know about the rare mosquito born illness Eastern equin and sephtis one person has died in New Hampshire from the rare mosquito born virus Eastern equin entis ee two more people in the Northeast have been infected with EE this summer prompting Health officials to raise concerns ee is more deadly than West Nile Virus and is not contagious between people it is only spread by mosquitoes there is no treatment for EE and about 30% of those infected die while many survivors face neurological issues cases appear yearly in the US mainly in eastern or Gulf Coast states but this year saw its first infections in years New Hampshire reported its first eii infection since 2014 resulting in the death of an adult in Hamstead Health officials urge residents to take precautions against mosquitoes especially during their active hours from Dusk to Dawn