Are Vaccines Only Tested for 4 or 5 Days?

Where do some folks get the idea that vaccines are only tested for 4.5 days?

Anti-vax protestors often carry signs that say vaccines are only tested for 4.5 days. Don't believe them.
Anti-vax protestors often carry signs that say vaccines are only tested for 4.5 days. Don’t believe them.

The usual suspects…

Are Vaccines Only Tested for 4 or 5 Days?

But who gave them the idea to put it on their sign?

Again, the usual suspects…

Did the idea that vaccines are only tested for 4.5 days come from JB Handley, Children’s Health Defense Director and Co-Founder of Generation Rescue?
Did the idea that vaccines are only tested for 4.5 days come from JB Handley, Children’s Health Defense Director and Co-Founder of Generation Rescue?

Before we actually look to see if the original clinical trials for the hepatitis B vaccines only “solicited adverse reactions” for four or five days after vaccination, lets see what the safety studies have shown since these vaccines were approved in the 1980s.

These and other studies have shown that the hepatitis B vaccines are safe.

What about the idea that we only know what happens in the first four or five days after the vaccine is given?

Hepatitis B Vaccine Safety Testing

That’s not true. There are plenty of long term studies and safety studies typically collect safety information for weeks and months after a child is vaccinated.

“Open-ended diaries were provided to the parent(s) or guardian of the child before the vaccination program began in which to record any health problems that occurred 1 month before and 1 month following each of the 3 doses of vaccine, whether or not a health professional was consulted.”

De Serres et al on Importance of attributable risk in monitoring adverse events after immunization: hepatitis B vaccination in children.

Still, it is important to note that the further you get from a vaccination, the less likely that an adverse event is actually going to be caused by the vaccine though.

Consider the study by De Serres, Importance of attributable risk in monitoring adverse events after immunization: hepatitis B vaccination in children, in which they looked at the reports of adverse events both before and after vaccination and concluded that “postimmunization incidence systematically overestimates the risk of adverse events.”

Vaccines are tested very carefully, starting with small phase I and phase II trials, before moving to larger and longer lasting phase III trials.
Vaccines are tested very carefully, starting with small phase I and phase II trials, before moving to larger and longer lasting phase III trials.

It is also very important to note that like other vaccines, the hepatitis B vaccine was well tested before it was approved.

Although this was an efficacy trial, it included a double blind, placebo control and the researchers did notice any side effects.
Although this was an efficacy trial, it included a double blind, placebo control and the researchers did notice any side effects.

And many of the studies did include a placebo group.

A lot of folks in the placebo group for the hepatitis B vaccine trials got hepatitis B.
A lot of folks in the placebo group for the hepatitis B vaccine trials got hepatitis B.

Unfortunately, a lot of the folks in the placebo groups ended up getting hepatitis B.

In one study, Hepatitis B vaccine: efficacy in high-risk settings, a two-year study, which included an unvaccinated control group – “The control group was comprised of 31 patients and 24 staff members who had not been in contact with HBV until they entered the units and who did not wish to be vaccinated.”

What happens when you do a vaccinated vs unvaccinated study?
What happens when you do a vaccinated vs unvaccinated study?

Importantly, this study found “no local or general reaction to the immunization. A monthly biological and clinical survey of the vaccinated subjects showed no evidence of complication due to vaccination, especially no sign of auto­immunity.”

So why do we still hear the myth that vaccines are only tested for 4.5 days?

Anti-vax folks need to convince their followers that vaccines aren’t safe.

A careful look at all that went into the development of the hepatitis B vaccines shows that they are.

It also shows that vaccines are very necessary.

More on Hepatitis B Vaccine Safety Testing

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2 thoughts on “Are Vaccines Only Tested for 4 or 5 Days?

  1. If you had read the Recombivax hb insert you would have read that they only followed each person for 5 days post shot. So that claim is indeed true. Also the 2 year study you posted was for efficacy not for safety. Funny…

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