If you visit the CDC website, you will see some ingredients with code names. Names that can be misleading and confusing, especially if you don't know what they mean. I'm going to take a few of those ingredients, straight from the CDC page, and give you the literal meaning of them. In other words, I'm going to define what these average looking ingredients really are.
MRC-5. Now the average person probably has no idea what this code stands for. This ingredient is found in the Rabies shot, the MMRV (thats the MMR plus the chicken pox) the Hep A/Hep B combo shot and the seperate Hep A shot.
Here is the lowdown on MRC-5: The MRC-5 cell line is commonly utilized in vaccine development, as a transfection host in virology research, and for in vitro cytotoxicity testing. Initiated in September 1966 by J. P. Jacobs, the cell line was derived from the human lung tissue of a 14-week-old male fetus aborted from a 27-year-old woman.
On to the next ingredient on the CDC list.: Bovine serum albumin. This ingredient is found in vaccines for Rotavirus, the MMR vax, the seperate Mumps vax, the seperate Measles vax, the Hep A vax and the DTaP vax.
Here is the lowdown on Bovine serum albumin (BSA): Bovine=of or pertaining to the subfamily Bovinae, which includes cattle, buffalo, and kudus. Serum=the clear, pale-yellow liquid that separates from the clot in the coagulation of blood; blood serum. Albumin=any of a class of simple, sulfur-containing, water-soluble proteins that coagulate when heated, occurring in egg white, milk, blood, and other animal and vegetable tissues and secretions.
And on to the next ingredient...This one is the most popular one and also the most controversial. Thimerosal. The CDC puts a disclaimer on it's page saying that even though the vaccines contain this ingredient, it should be treated as if the vaccine does not have the ingredient. That only "trace" amounts are found in the vaccines. Heres the thing, trace amounts can still be dangerous, any amount of this substance in our bodies can cause great harm. Here are the shots that contain Thimerosal: Influenza vax (flu vax), Hep A/Hep B combo shot, seperate Heb B shot, DTaP vax and the Td vax (Tetanus vax).
Heres the lowdown on Thimerosal: Thimerosal is a mercury-containing organic compound (an organomercurial). In other words, this is the mercury ingredient that is sparking so much controversy.