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Passive Immunity

Definition: Passive immunity is the short-term immunity that results from the introduction of antibodies from another person or animal.Vaccination: Receiving a vaccine for diseases like measles, mumps, and rubella (MMR) stimulates the immune system to produce antibodies and memory cells, providing long-term protection.### Herd Immunity Definition: Herd immunity is the indirect protection from an infectious disease that occurs when a large percentage of a population becomes immune to the disease, thereby reducing its spread.COVID-19 Vaccination: Widespread vaccination against COVID-19 can reduce transmission, protecting individuals who are unable to be vaccinated or who have weaker immune responses.Dengue Virus Serotypes: Infection with one serotype of the dengue virus may provide partial immunity to other serotypes, though it can also lead to more severe disease upon subsequent infections (antibody-dependent enhancement).Measles Vaccination: When a significant portion of the population is vaccinated against measles, it protects those who are not immune (such as infants or those with medical conditions preventing vaccination).Maternal Antibodies: Newborns receive antibodies from their mothers through the placenta before birth and through breast milk after birth, providing them with temporary immunity against infections.Immunoglobulin Therapy: Patients exposed to certain diseases (like rabies or hepatitis B) are given immunoglobulins, which contain antibodies to help protect against these diseases.### Active Immunity Definition: Active immunity is the long-lasting immunity that results from the production of antibodies by the immune system in response to the presence of an antigen.### Cross-Immunity Definition: Cross-immunity occurs when exposure to one pathogen provides immunity to a related, but different, pathogen.Cowpox and Smallpox: Exposure to the cowpox virus provides immunity against smallpox.Natural Infection: After recovering from chickenpox, a person's immune system will remember the virus and provide long-term protection against reinfection.This was the basis for the first smallpox vaccine.Examples: 1.Examples: 1.Examples: 1.Examples: 1.2.2.2.2.

Passive Immunity

Definition: Passive immunity is the short-term immunity that results from the introduction of antibodies from another person or animal.

Examples:

1. Maternal Antibodies: Newborns receive antibodies from their mothers through the placenta before birth and through breast milk after birth, providing them with temporary immunity against infections.


2. Immunoglobulin Therapy: Patients exposed to certain diseases (like rabies or hepatitis B) are given immunoglobulins, which contain antibodies to help protect against these diseases.

Active Immunity

Definition: Active immunity is the long-lasting immunity that results from the production of antibodies by the immune system in response to the presence of an antigen.

Examples:

1. Vaccination: Receiving a vaccine for diseases like measles, mumps, and rubella (MMR) stimulates the immune system to produce antibodies and memory cells, providing long-term protection.


2. Natural Infection: After recovering from chickenpox, a person’s immune system will remember the virus and provide long-term protection against reinfection.

Cross-Immunity

Definition: Cross-immunity occurs when exposure to one pathogen provides immunity to a related, but different, pathogen.

Examples:

1. Cowpox and Smallpox: Exposure to the cowpox virus provides immunity against smallpox. This was the basis for the first smallpox vaccine.


2. Dengue Virus Serotypes: Infection with one serotype of the dengue virus may provide partial immunity to other serotypes, though it can also lead to more severe disease upon subsequent infections (antibody-dependent enhancement).

Herd Immunity

Definition: Herd immunity is the indirect protection from an infectious disease that occurs when a large percentage of a population becomes immune to the disease, thereby reducing its spread.

Examples:

1. Measles Vaccination: When a significant portion of the population is vaccinated against measles, it protects those who are not immune (such as infants or those with medical conditions preventing vaccination).


2. COVID-19 Vaccination: Widespread vaccination against COVID-19 can reduce transmission, protecting individuals who are unable to be vaccinated or who have weaker immune responses.