Transovarian transmission of infection occurs in -
Ticks transmit disease by biting (larva and nymph also by biting) - Trans-stadially Experiments in ticks have shown trans-ovarian transmission of infection through successive generations. REF: PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE, 25TH EDITION, PG NO. 840
Fleas
Ticks
Mosquitoes
Sandfly
Environment and health