Before revision: Transovarial or transovarian transmission occurs in certain arthropod vectors as they transmit disease-causing bacteria from parent arthropod to offspring arthropod.
After revision: 250px|Transovarial and transstadial transmission of the Ixodes tickTransovarial or transovarian transmission occurs in certain arthropod vectors as they transmit disease-causing bacteria from parent arthropod to offspring arthropod.