1. An infant receives her first dose of an oral vaccine. The nurse explains to her parents that the vaccine is a weaken virus. What type of immunity is
being conferred on the infant? What type of immunity did the infant from
her mother in uterdand when she was breast fed by her mother? What
classes of antibodies were given to her by her mother?

- Active Immunity

- Passive Immunity

- IgA

Explanation:

Live virus vaccines use the weakened (attenuated) form of the virus. The measles, mumps, and rubella (MMR) vaccine and the varicella (chickenpox) vaccine are examples.

Active Immunity - antibodies that develop in a person's own immune system after the body is exposed to an antigen through a disease or when you get an immunization (i.e. a flu shot). This type of immunity lasts for a long time.

During the last 3 months of pregnancy, antibodies from the mother are passed to her unborn baby through the placenta. This type of immunity is called passive immunity because the baby has been given antibodies rather than making them itself.

After birth, these maternal antibodies wane in the first 6 to 12 months of human life. The neonate and infant can receive additional maternal protection from breast milk, however. Human breast milk contains large quantities of secretory IgA.

Secretory Immunoglobulin A (IgA) is a special immunoglobulin. It's the main antibody found in your breast milk. IgA is considered the most important immunoglobulin in breast milk, and it's also the one that's talked about the most. Babies are born with low levels of IgA.

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