State officials have discovered a case of a rare virus in Nassau County caused by mosquitoes.

Officials found the first of the LaCrosse virus ever in Nassau in mosquitoes in Woodbury. According to health officials, those affected by the virus have mild flu-like symptoms, in the worst cases encephalitis, and rarely the virus can lead to death. Children 16 and under are most vulnerable to the virus.

Unlike other mosquitoes that usually bite at dawn or dusk, those carrying the LaCrosse virus bite all day.