Is the CDC Hiding MMR Excipients?

Have you heard the latest conspiracy theory – that the CDC is hiding MMR excipients? Depending on who you are supposed to believe, “they” recently removed either WI-38 or MRC-5 DNA and Cellular Protein from the MMR II excipient list.

I wonder why Ashley Everly and Hillary Simpson didn’t look at the 2012 list of excipients and ingredients

Is it true?

Is there a conspiracy at CDC to hide vaccine ingredients?

Is the CDC Hiding MMR Excipients?

Of course not!

Where were the WI-38 cells in the 2007 excipient list?

As most folks should know by now, it is hard to change and hide stuff on the Internet, as nearly all pages are archived.

What does that mean?

You can easily look up and see how a page looked yesterday, last week, last month, or last year. Or in the case of the CDC Vaccine Excipient and Media list, over 12 years ago!

And guess what?

MRC-5 cells were never on the MMR list because the MMR vaccine isn’t made with MRC-5 cells!

The MMR vaccine is made with chick embryo fibroblasts and WI-38 human diploid lung fibroblasts, but since neither remain in the final vaccine, they aren’t on the latest excipient list. They can still be found in vaccine’s package insert.

Substances used in the manufacture of a vaccine but not actually listed as contained in the final vaccine can be found in the package insert for the vaccine, but are no longer shown on the excipient table.

This change to the excipient list was made in 2019.

Why the change?

Probably because this more accurately reflects what’s in the vaccine! Remember, many of the things that are used to make a vaccine get filtered out along the way.

Interestingly, while chick embryo fibroblasts were on the original excipient list, in 2007, WI-38 human diploid lung fibroblasts weren’t.

From 2012 to 2019, the excipient list did include substances that were removed from the final vaccine.

They were briefly added, but then both were removed with the change to the excipient list in 2019.

And that’s why anti-vax folks think that there is some conspiracy to hide them.

A conspiracy to hide these excipients that explains that why excipients are not included on the list and not only tells you where to find them, in the vaccine’s package insert, but also includes a link to find them?

The vaccine package insert still lists excipients that might not remain the final vaccine and aren’t on the excipient list.

Have anti-vax folks run out of things to be scared of?

Still think that there is a conspiracy to hide excipients?

Consider that the Vaccine excipient table at the Institute of Vaccine Safety, maintained since 2006, has never listed WI-38 cells…

More on Anti-Vax Conspiracy Theories

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