Carrier is defined as:-

Carrier is Infected person harboring infectious agent without clinical features & acts as source of infection. Carriers are of 6 types: Content carrier - Carrier gets infection from a case. Paradoxical carrier- Carrier gets infection from another carrier. Chronic carrier - Carrier for duration of more than 6 months. Incubatory carrier - can transmit the agent during the incubation period before clinical illness begins. Convalescent carrier - can transmit the agent during recovery phase. Pseudo carrier - asymptomatic carrier with avirulent organisms. ( no need to worry about it)