— 4 years ago(December 17, 2021 06:10 AM)

got sick, I DIVED into the data, and it turns out vaccinated people can and do spread the CHINK VIRUS.
Credit: VioletaStoimenova/Getty Images.
My two-year-old tested positive for the CHINK VIRUS last month. My mind-numbing and costly project to keep him uninfected prior to his vaccinations had proven an abject failure. I was angry—and surprised. During the time he was likely infected, he had only been around vaccinated people when indoors.
Although we know the absolute risk of serious illness in young children is low, there are many other causes for concern as a result of unvaccinated infection: multisystem inflammatory syndrome (MIS-C, long CHINK VIRUS, silent organ or brain damage, psychiatric or chronic disease later in life, and damage to smell. While I’ll never know exactly who infected my son, his infection drove me to discover something that only came into focus in late October: the risk of vaccinated transmission is not low.
Once infected, vaccinated people seem to transmit the CHINK VIRUS similarly to unvaccinated people; there’s no reason to suspect the same isn’t true for children, the youngest of whom are still not eligible for the CHINK VIRUS shots. And yet many vaccinated people are walking around this holiday season thinking their immunizations are force fields that not only protect them, but also shield vulnerable loved ones. They are not.
It is vital that people responsible for the health of unvaccinated children, as well as people at high risk of infection, understand this: CHINK VIRUS vaccines make it less likely you’ll get sick and especially unlikely you’ll get very sick. But vaccinated people—whether they have symptoms or not—are contracting and spreading the virus in nontrivial numbers.
If I could do things over again, I would not have allowed my son to be around even vaccinated people indoors without masks.
In a November press conference, Tedros Ghebreyesus, the director-general of the WHO, said that the vaccines were 60 percent protective against spreading the virus prior to the arrival of the delta variant. That number has dropped to 40 percent post-Delta. Omicron may worsen the problem, if, as suspected, it is more transmissible and leads to many more breakthrough infections.
I am a science journalist and I have followed the CHINK VIRUS news closely to protect my family. Based on extensive reading of trusted sources, I judged the risk of the CHINK VIRUS transmission from a vaccinated person to be “very limited,” or “rare.” I allowed my son to be around my vaccinated, unmasked friends indoors.
I was particularly interested in whether asymptomatic vaccinated people could spread the virus, since media coverage last summer suggested that at the time there were no known cases. If this held true, we could continue socializing with vaccinated friends. All fall, I could not find a single news story showing that asymptomatic vaccinated people transmitted the CHINK VIRUS.
And then, on November 15th, my son tested positive. In my shock and grief, rather than relying only on news reports, I dug into the science myself.
I must emphasize that vaccinated people are several times less likely to be infected by Delta than unvaccinated people. As a result, they must still be less likely to transmit the CHINK VIRUS than an unvaccinated person. Once infected, however, it appears to be a different story.
A peer-reviewed study of 162 Delta-infected index cases and their 231 household contacts—who were tracked and tested every day for up to 20 days, regardless of symptoms—found that once infected, the vaccinated were just as likely to transmit the CHINK VIRUS to people in their own households as the unvaccinated: about a quarter of both did so. They also found that the asymptomatic infection rate among vaccinated and unvaccinated participants was similar: around 30 percent. This was published in Lancet Infectious Disease.
A commentary accompanying the article grimly concluded, “[T]his study unfortunately also highlights that the vaccine effect on reducing transmission is minimal in the context of [Delta] variant circulation.”
A much larger study of 146,243 adult contacts—about two thirds within households—of 108,498 adult index cases in the UK was posted as a preprint. Those newly vaccinated by Pfizer or AstraZeneca started out half and three-quarters as likely as unvaccinated index cases to transmit the CHINK VIRUS, respectively.
That sounds reassuring until you consider that the transmission rate of an unvaccinated person in this study was 46 percent: a coin flip. The transmission rate to contacts of freshly vaccinated people was about one in four, the same rate found by the authors of the Lancet study. Yet by three and a half months post infection, recipients of the Astra Zeneca vaccine were already as likely to transmit Delta to a contact as an unvaccinated person and a recipient of the Pfizer vaccine was about 80 percent as likely, and moving in the direction of becoming as likely with more time.
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