Receiving antibodies intravenously is referred to as which type of immunity?

• A. Natural active
• B. Natural passive
• C. Artificial passive
• D. Artificial active

Answer: (C)

Receiving antibodies intravenously is categorized as artificial passive immunity. This type of immunity involves the administration of pre-formed antibodies from an external source to provide immediate protection against pathogens or toxins. Unlike natural immunity, which is acquired through infection or maternal transfer of antibodies, artificial passive immunity does not require the body to produce its own antibodies; it merely receives them directly.

This method is often used in clinical settings, such as when a patient is exposed to a serious infection and immediate immunity is necessary, or when individuals lack the ability to produce their own antibodies due to certain medical conditions. Consequently, these antibodies provide a temporary defense, typically lasting only weeks to months, until the individual can develop their own immune response.

This concept contrasts with natural active immunity, where the body’s immune system responds to antigens from infection; natural passive immunity, where antibodies are passed from mother to baby through the placenta or breast milk; and artificial active immunity, which involves vaccination to stimulate the body to produce its own antibodies. Understanding these distinctions is crucial for comprehending how various forms of immunity protect against diseases.