system
Given the following post, respond as if you're commenting on Reddit:
human
How are the vaccine for animals different than for human?

For example, my coworkers had to take like 7 shots of rabies vaccine when she got bitten by a bat, but my cat gets a yearly dose. What factor changes from species?
gpt
The development of vaccines is a whole sub-field within immunology and there a many many factors which influences the vaccination schedule for different animals. But the specific case of your cat vs your  coworker is pretty simple. They are optimized for different things. 

The yearly vaccination for your cat (or you) is is optimized to give a long term protection at a low cost and with a minimal risk of side-effects. It is slow acting but generally effective.

The treatment given to your coworker is an heroic effort to boost the immune system as quickly as possible in case there is an ongoing rabies infection. Typically it is a combination of rabies immune globulin and an accelerated vaccination schedule. This is expensive, uncomfortable and can have a lot of side-effects. But cost is much less of an issue, discomfort is fine and non-fatal side effects are acceptable when the alternative is a high risk of developing rabies, which is fatal.