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Immunoglobulin is a general term referring to a sort of protein in the immune system which is generally synonymous with the term Antibody. Rhogam is a treatment administered to pregnant women which are bloodtype Rh- but carrying bloodtype Rh+ fetuses. This prevents hemolytic disease of the newborn in which mom's immune system recognizes the baby as foreign and begins attacking the baby's cells. Rhogam is a type of polyclonal antibody (pooled from the serum of many different women) treatment (aka an immunoglobulin) which essentially "tricks" mom's immune system into thinking she already has immunity to the baby's cells that are being recognized as "foreign". Therefore, mom's immune cells are tricked into ignoring the baby's cells and thus not attacking them. This is a very basic and crude definition, I suggest a textbook for more detailed explanation.

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Q: What is the difference between rhogam and immunoglobulin?
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Tetanus is a disease that affects the muscles and the respiratory system. The difference between tetanus and TIG or tetanus immunoglobulin is that the latter is a form of preventative vaccine for tetanus.

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