Transmission
of
Oncornaviruses - Transmission of the virus may be horizontal or vertical.
Horizontal transmission takes place from host to another by contagion, Vertical transmission takes place from parent to offspring.
Vertical transmission may be congenital or genetic.
Congenital transmission is from the mother to the offspring through the ovum, placenta or milk.
In the C3H strain of mice, milk, is ,the transmitter of the mouse mammary cancer agent.
Genetic transmission can take place through the father or the mother.
It is
from one host generation to another as a DNA provirus.
Mammary tumours in the GR strain of mice are examples of genetic transmission.
