
Transmission
Not Physical
 In this context, 'transmission' means spreading information or diseases, not physical items. 
Washing hands helps prevent the transmission of germs.
 Broad Scope
 'Transmission' here can refer to both intentional and unintentional spreading. 
The transmission of rumors in the school was unintentional.
 Implies Connection
 Use 'transmission' when there's a clear source and recipient of what's being transmitted. 
The transmission of knowledge from teacher to student is essential.