1) Entry sites, how virus spreads between animals:
Mouth, pharynx, gut;
Respiratory tract;
Broken epidermis- cuts, bites or insects;
Genital tract.

2)Primary replication.

Replication at the mucosal surface at the site of entry.

3)Dissemination.

i) Local down the respiratory or alimentary tract.
ii) Systemic via the lymph and blood.
iii) Neural e.g. rabies.