Shedding and Vaccines

Unlike many other myths about vaccines, shedding is a real thing.

It is just much, much less common than it is made out to be.

And it is very rarely something to be concerned about.

There is especially no research to suggest that children who were recently vaccinated, except in rare and very specific circumstances, need to be kept away from others to keep them from getting sick.

And definitely no reason to listen to the advice of one organization who calls for “a two-week quarantine of all children and adults who receive vaccinations.”

So what is shedding?

Shedding occurs when an infectious agent, typically a virus, can be found in urine, stool, and other bodily secretions. Shedding is not specific to vaccines though. Shedding occurs very commonly after natural infections too, which is one reason they are so hard to control.

Shedding is rarely an issue with vaccines though.

In fact, most vaccines are inactivated and don’t shed, including DTaP, hepatitis A, hepatitis B, Hib, flu, IPV, HPV, meningococcal, pneumococcal, and Tdap shots.

Also, except for the oral polio vaccine, which is no longer used in the United States, even close contacts of people with immune system problems can get “standard vaccines because viral shedding is unlikely and these pose little risk of infection to a subject with compromised immunity.” The only circumstance where a live vaccine would be restricted because of theoretical concerns over shedding is for FluMist and close contacts of a severely immunocompromised patient who is in a protective environment (like after getting a stem cell transplant).

Other standard, live vaccines that might possibly shed are the chicken pox, MMR, and rotavirus vaccines.

The rotavirus vaccine only sheds in stool though, so routine hygiene techniques during diaper changes can prevent you from getting sick after your child gets this vaccine. We definitely aren’t seeing outbreaks of rotavirus triggered by shedding, so this likely works. Rotavirus infections are down significantly since we started routine vaccinations.

Chicken pox is also down significantly since we started vaccinating. There are no outbreaks because of shedding, which can occur, but only if the vaccinated person first develops a rash. Keep in mind that there are only a handful of reports that this has ever happened and if you did get sick, you would get the attenuated strain of chicken pox, not the more serious wild strain.

And what about the MMR vaccine. Although it is thought that rubella may shed into breastmilk after getting vaccinated, getting measles would be unheard of. Again, cases of measles are way down in the post-vaccine era.

The vaccinated are not spreading measles, chicken pox, or any other vaccine-preventable disease.

More on Shedding

28 thoughts on “Shedding and Vaccines

  1. Why is shedding specifically talked about in the vaccine insert for MMR & pertussis whooping cough, telling people to stay away from unvaccinated babies & immune compromised individuals for 28 days after vaccination, then? Who is speading dangerous myths here when the manufacturers of the vaccines put this information in their own vaccinations inserts about warnings, risks & known side effects for these live vaccines?


  2. Pingback: VAPP – VAXOPEDIA
  3. I have been forced to have several vaccinations for international travel recently and was advised to avoid contact with my daughter’s new born baby and any other babies or elderly person.persons. If I’m not able to infect others from these vaccines, why was I given this advice?


  4. I have been forced to have several vaccinations for international travel and was advised to avoid my daughter’s new born and other babies and elderly persons. If I’m not able to infect others via these vaccines, why was I given that advice?


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