Category Archives: Vaccine Terminology

Vaccine Shedding: Should You Really Be Concerned?

Question: My child just got the MMR vaccine and has a bit of a rash. Should I be concerned about him giving his friends the measles?

Short answer: Nope.

Long answer: Sounds like you’re worried about “vaccine shedding”.

Let’s first discuss what “viral shedding” is. When someone gets sick with a virus, they become contagious and can spread the virus to someone else. The spread happens when the viral particles are expelled from the sick person’s body via a cough or sneeze, or transferred by direct contact to another person. The “shedding” is the viral particles leaving the sick person’s body. You can probably picture this happening, like shedding dead skin cells. Virus all over the place!

When people throw the term “vaccine shedding” around, they are referring to the virus in the vaccine being shed from a recently vaccinated person’s body. Before getting into vaccine shedding, I want to stress that this is super rare. Lots of parents are concerned about their children catching viruses from vaccinated children, when they should really be concerned about catching the virus from unvaccinated children. Continue reading

Descendants of human fetal cells in the making of vaccines

shot and vialAre there fetal cells in vaccines? No. Do some vaccines contain viruses grown in cells from human fetal origin? Yes. But, I feel this needs some explanation.

And before I get started, this isn’t meant to be a debate or opinion article. These are just the facts as I’ve researched them. And before I get into the issue at hand, you’re going to be getting a microbiology lesson…

The cell theory states: All cells arise from pre-existing cells.

Remember the term mitosis from biology class? That’s how parent cells make their daughter cells. The parent cell replicates all of their chromosomes into two sets and then splits into two cells, leaving one set of chromosomes in each cell. That’s it, in a nutshell. This happens over and over and over: parents forming daughters, and daughters becoming parents and forming more daughters. Continue reading

The Use of Formaldehyde in Vaccines. (This chemical may surprise you.)

Formaldehyde, a chemical used to preserve dead bodies, sure does have a bad name! But, when it comes to our bodies, this chemical may surprise you.

First off, some vaccines contain formaldehyde.


Some vaccines work because the virus that causes disease or the toxin that causes a bacterial infection is inactivated for use in the vaccine. (Inactive viral vaccines.) (Toxoid vaccines.) Formaldehyde is the chemical used to do the inactivating.

Once the virus or bacterial toxin is inactivated, the viral particles or bacterial toxin is further processed. In doing so, the formaldehyde used in the inactivation becomes so dilute in the liquid suspension that when the vial hits the doctor’s office, just a trace amount of formaldehyde is actually injected into your body.

This amount is so small that it doesn’t even hold a candle to the amount of formaldehyde found naturally in your body. Continue reading

Thimerosal as a Preservative in Vaccines

AU National Review

Preservatives are used in vaccines to prevent or kill any growth of bacteria, fungi, or other microorganisms that might have contaminated the vaccine vial. Microorganisms are able to get into the vials that are punctured more than once with a needle. Multiple punctures only occur in vaccine vials that are labeled as multi-dose vials and are intended to be used with different needles more than one time.

Due to tragic events in vaccine history, such as the infection of children with deadly bacteria after injection with multi-dose vaccines, the United States Code of Federal Regulations (the CFR) required preservatives be added to multi-dose vials of vaccines. Because of many incidences of infections due to vaccinations, preservatives have been required in multi-dose vaccines since the 1930’s.

Since then, thimerosal has been the most widely used preservative in multi-dose vaccines. It has a long record of safety and has been proven effective at preventing bacterial and fungal contamination of vaccines. However, over the past several years, thimerosal has become a target for controversy due to its mercury concentration and concern for safety.

Continue reading

How are vaccines made and released to the public?

A vaccine’s main goal is to teach your immune system to recognize and remember a bacteria or virus.
The word “vaccination” means to stimulate the immune system to make antibodies against the bacteria or virus targeted by the vaccine.
“Immunization” is different; it’s used in relation to injecting a person with pre-formed antibodies to a particular disease to make the person immune to it.
These terms are often used interchangeably, and that’s just fine, however it’s important to understand that these are two very different ways of creating immunity to a disease.