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<strong>The</strong> <strong>Emerging</strong> <strong>Risks</strong> <strong>of</strong> <strong>Live</strong> <strong>Virus</strong> & <strong>Virus</strong> <strong>Vectored</strong> <strong>Vaccines</strong>:<br />
Vaccine Strain <strong>Virus</strong> Infection, Shedding & Transmission<br />
No Active Surveillance <strong>of</strong> Vaccine <strong>Virus</strong> Shedding<br />
In addition to the Sabin oral polio vaccine, the live virus vaccines most <strong>of</strong>ten associated<br />
with vaccine strain live virus infection, shedding and transmission are smallpox and<br />
chickenpox (varicella zoster) vaccines. <strong>The</strong>re are also a few published reports in the<br />
medical literature <strong>of</strong> vaccine strain influenza, measles, mumps, rubella and rotavirus<br />
shedding and transmission.<br />
Although public health <strong>of</strong>ficials acknowledge that vaccine strain live virus shedding does<br />
occur in recently vaccinated persons, they say that it rarely causes symptoms or serious<br />
complications in others and the benefits <strong>of</strong> using live virus vaccines far outweigh the<br />
risks<br />
101 102<br />
<strong>The</strong>re is no active surveillance and testing for evidence <strong>of</strong> vaccine strain live<br />
virus shedding, transmission and infection among populations routinely being<br />
given multiple doses <strong>of</strong> live virus vaccines, including measles vaccine.<br />
103 104<br />
<strong>The</strong>refore, it is unknown exactly how many vaccinated children and adults in the<br />
U.S. or other countries are shedding and transmitting vaccine strain live viruses.<br />
Whether or not vaccine strain live virus shedding, transmission and infection is causing<br />
undiagnosed or misdiagnosed health problems, especially among people with severe<br />
immune deficiencies or autoimmune and other immune system disorders, is an open<br />
question.<br />
Many People with Viral Infections Have No Clinical Symptoms<br />
One <strong>of</strong> the big problems with diagnosing illness is that both vaccinated and<br />
unvaccinated people can experience and recover from a viral infection, including<br />
shedding infectious virus, 105 106 but show only mild or no clinical symptoms.<br />
110<br />
[Bacterial infections like B. pertussis whooping cough can also be transmitted by<br />
vaccinated or unvaccinated persons showing no symptoms.]<br />
111 112<br />
107 108 109<br />
Outside <strong>of</strong> the medical community, there is little public awareness about the fact that<br />
you can be infected with, shed and transmit wild-type virus or vaccine strain live virus<br />
without having any symptoms at all.<br />
Wild-Type Polio Infection Often Asymptomatic<br />
A well-documented example <strong>of</strong> a viral infection that is asymptomatic in most people is<br />
poliovirus infection. <strong>The</strong> majority <strong>of</strong> people, who were infected with wild-type poliovirus<br />
before the polio vaccine was created in the 1950’s and those infected today, are<br />
asymptomatic and recover from polio infection without any complications. However,<br />
having no symptoms does not affect a person’s ability to shed and transmit the virus to<br />
another person, who may go on to develop complications and become paralyzed.<br />
According to the CDC, “up to 95% <strong>of</strong> all polio infections are inapparent or asymptomatic.<br />
Estimates <strong>of</strong> the ratio <strong>of</strong> inapparent or paralytic illness vary from 50:1 (usually 200:1).<br />
NVIC Referenced Report – Nov. 2014, Page 14
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