What Causes Numbness In Leg After Taking Rabies Vaccination?

A stray dog bit me on 10 th March. In about half hour to 40 minutes, i could reach home and i washed the wound with copious water & soap. Then i went to my doctor who gave me a tetanus and also started the rabies vaccine series. On 13 th i had my second dose. However, i get sudden numbness in that leg. What s the reason?