Research confirms that vaccinated children can spread measles


It is a common perception that diseases go viral if a proper vaccination isn’t practiced. However, a study, published in the journal Clinical Infectious Diseases, reveals that vaccinated individuals actively contract diseases like measles and spread it to others as well. It is a common claim that unvaccinated individuals are directly responsible for triggering the handful of viral outbreaks. However, this research displays the other side of the picture.

Recently, the United States had faced measles’ outbreak. The parent community is condemning the unvaccinated children for the spread of the disease. However, studies show that it’s actually the vaccinated “herd” to be blamed in many cases.

This research contradicts to the government’s tenuous claim that unvaccinated people are the ones putting public health at risk. It says that vaccinated people are capable of both,

  1. Getting infected with the disease, they’ve been vaccinated against
  2. Transmitting them secondarily and infecting others

The research was carried out by a team of researchers from the Bureau of Immunization, the New York City Department of Health and Mental Hygiene, the National Center for Immunization and Respiratory Disease, and the Centers for Disease Control and Prevention (CDC).

All of the research team looked at the evidence from a 2011 measles outbreak in New York. It was as usually blamed on the unvaccinated population. However, the research team found that the cause of this particular outbreak was a vaccinated individual.

What does the study suggest?

This study implies that vaccination doesn’t protect a person from catching a disease. Moreover, it says that a vaccinated person can definitely act as a carrier for disease and spread it around. It suggests that vaccines like MMR (measles, mumps, and rubella) don’t actually work in all cases.

The study explains that four secondary cases, out of 88 contacts, were confirmed that had either two doses of measles-containing vaccine or a past positive measles IgG antibody. All the cases had laboratory confirmation of measles infection, clinical symptoms consistent with measles, and high greed IgG antibody characteristic of a secondary immune response.

What is significantly notable is that even being vaccinated twice with MMR didn’t provide protection against disease among individuals. The individual to whom the New York measles outbreak was traced had been vaccinated not once, but twice. Nevertheless, this was found to augment the mortality rate of measles infection.

This is the earliest report of measles transmission from a twice vaccinated individual. The clinical presentation and laboratory data of the index were typical of measles in an immature individual. Secondary cases had vigorous anamnestic antibody responses.


In simple words, the study says that a twice-vaccinated individual caused the 2011 New York measles outbreak. It spread the disease to four of her contacts. Note that the two of them had also received two doses of MMR prior to contracting the illness and spreading it to others.

The MMR vaccine doesn’t provide real protection against disease. It causes disease contraction among individuals that are both vaccinated or not. Thus, non-vaccinating parents can’t be blamed for the morbidity and mortality of infectious diseases. The vaccination does not guarantee 100% immunity. It can work equally for the disease spread.


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Areeba Hussain
The author is a Medical Microbiologist and healthcare writer. She is a post-graduate of Medical Microbiology and Immunology. She covers all content on health and wellness including weight loss, nutrition, and general health.


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