why do rabbi shots have to be injected through the abdominal??

At one time, the rabies vaccine (and by the way, rabies is the only disease in which the vaccine is administered post-exposure) required slow absorption and prolonged activity, so it needed to be injected in an area with a large amount of subcutaneous fat. In humans, that area is the abdomen (the upper arm and buttocks are more muscle than fat). Today’s rabies vaccine is a series of five shots given in the upper arm over the course of one month. In the United States, the most likely carriers of the disease in the wild are foxes, raccoons, skunks and bats. Rodents and lagomorphs (hamsters, squirrels, rabbits, chipmunks, etc.) have rarely tested positive for rabies.

Source (not a great site):
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The information provided in the question appears to be inaccurate. The rabies vaccine is not typically administered through the abdominal area. Instead, it is commonly administered in the upper arm.

The reason the vaccine is given in the upper arm is because it contains a muscle that is easily accessible for injection. This area also has enough subcutaneous fat to allow for efficient absorption of the vaccine. The upper arm is a common site for various vaccinations in adults.

It's important to note that if you have specific questions or concerns about a vaccination procedure, it is always best to consult with a healthcare professional who can provide accurate and up-to-date information.