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For example:

• Bovine viral diarrhoea virus can produce a carrier state where the animal remains persistently infected, never grows very well and continually sheds the virus. Animals persistently infected with BVD can spread virus to infect other animals.
• Some animals that clinically recover from pinkeye will remain carriers of Moraxella bovis. The bacteria can live in the eyes, nose, and vagina of these carrier animals. Flies carry the disease from these animals to other non-carrier animals, sometimes this causes disease if the other host, agent, and environmental characteristics are right.