Studies to test safety Although, as a result of less regulation  some vaccines have been found to contain several impurities. An example of this is the rabies vaccine containing a significant amount of Bovine serum albumin (BSA). BSA can cause severe allergic reactions that can lead to death . Although, the vaccine has now been produced effectively for two decades .
Studies to test safety As a result of less regulation , some vaccines have been found to contain impurities. An example of this is the rabies vaccine containing a significant amount of Bovine serum albumin (BSA). BSA can cause severe allergic reactions that can lead to death .
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