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For any organism (virus/bacteria/parasite) to infect a person, its certain amount has to enter the human body (this amount is called bolus); and if the amount is not sufficient, either they are not able to pass the immunity barriers like skin or the immune system clears off the infectious organisms spontaneously.
For example, if two people are injected with HIV infected blood; one get only a drop while the other person gets a full syringe filled with blood, the chances of getting the infection are high for the later.
Similarly, if there is an animal shedding rabies virus in the sea, it will be so much diluted that it wont be able to produce infection to any one.
Also, the rabies virus can not with stand the saline water for long and gets killed easily.
Finally there is no such reported case of rabies until now that has been infected the way you have described (this is a proof that rabies can not be transmitted this way).
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