By comparing COVID vaccination during pregnancy to those unvaccinated during pregnancy, the agency determined COVID vaccines were not associated with preterm birth or with delivering a child who was born smaller or less developed than expected, also known as small-for-gestational-age (SGA).
In this article, we examine flaws in the CDC study that led to the agency’s wrongful conclusion that COVID vaccines are “safe” for pregnant women.
Including Pregnant Women in Clinical Trials
Pregnancy is a precarious time not just for the expectant mother but most importantly the developing fetus. Expectant mothers are advised not to drink alcohol or caffeinated beverages and not to eat raw foods such as sushi and deli meats.Women are advised not to take these medications during pregnancy because they pose potential risks to the developing fetus.
For decades, expectant mothers have been considered a vulnerable group to be shielded from potential harms of research for the sake of their fetuses’ health.
Reproduction Toxicity Studies in Animal Models Hinted at Dangers Early On
While the companies developing the COVID-19 vaccines have done preliminary studies in animals, their studies were limited to rodents. The vaccine makers did not conduct studies on non-human primates, recognized as the closest animal models to humans regarding genetics, physiology and behavior.The report noted (page 50: Reproduction Toxicity) an increase in the number of fetuses with common skeletal variations of one or more rib nodules and one or more wavy ribs. Additionally, the number of pups born to vaccinated rats was lower than the number in the unvaccinated rats.
Most importantly, the authors explicitly stated, “In this study, no vaccine dose was administered during the early organogenesis [the period during embryonic development of an animal when the main body organs are formed], to address the direct embryotoxic effect of the components of the vaccine formulation.”
The authors of the Pfizer report further stated (Page 50: Reproduction Toxicity) that “a very low incidence of gastroschisis, mouth/jaw malformations, right-sided aortic arch, and cervical vertebrae abnormalities” occurred in litters of exposed rats, and that these findings were within historical control data.
This finding brings up an important question: Why compare the incidence of these major congenital abnormalities with “historical” controls and not with the controls themselves?
But were obstetricians made aware of the potential safety signals appearing in animal models?
CDC’s Latest Study: A Closer Look at the Details
Using data from the Vaccine Safety Datalink — a CDC vaccine safety monitoring system the public cannot access — the CDC study identified 46,079 pregnant women with live births and gestational age.Of those, 10,064 (21.8%) received ≥1 COVID vaccine doses during pregnancy from Dec. 15, 2020, to July 22, 2021.
Nearly all (9,892, or 98.3%) of the pregnant women included in the study were vaccinated during the second or third trimester.
The authors found that among unvaccinated women, the rate of premature births was 7% compared to 4.9% in those who had received either one or both vaccine doses.
The rate of small-for-gestational-age in both vaccinated and unvaccinated mothers was equal (8.2%).
5 Flaws in the CDC Analysis
On closer examination, we identified the following five deficits in the CDC study:- Cohorts were not well matched. There were greater than three times more African American women in the unvaccinated group than in the vaccinated group. The CDC acknowledges the African American race is a risk factor for preterm birth and may be as high as 50% greater than in white women.
- No adjustment for mothers with a history of preterm birth of SGA. The authors did not address this potential confounder.
- COVID infection, another potentially important confounder, was present in the unvaccinated group at a 25% greater incidence than in the vaccinated cohort (3.5% vs 2.8%). There was no mention of when in the pregnancy the infection was detected.Viral infections early in pregnancy are particularly deleterious to the developing fetus. This should have been an important risk factor to quantify independently, especially when establishing a risk-versus-benefit ratio of vaccination.
- The CDC data indicate a 7.7% risk of preterm birth in mothers having received one of two vaccines. This represents a 10% greater risk than in unvaccinated pregnancies. This increased risk is not mentioned in the discussion. Moreover, the adjusted Hazard Ratio (aHR) in this population is given as 0.78, indicating a 22% risk reduction in preterm birth in vaccinated mothers, seemingly conflicting with the raw data. (A request for clarification from the corresponding author was not answered).
- The most glaring deficit in the CDC analysis is the scarcity of vaccinated mothers who received a vaccine in the first trimester in this study. The risk of untoward outcomes (birth defects, miscarriages) in pregnancy is greatest during the first third of pregnancy, a time when crucial embryonic structures are developing. This is the period of time where maternal health is particularly important, and exposure to toxins, infections and certain medicines must be minimized or eliminated entirely if possible.
CDC Not Required to Provide Access to Its Data or Subject Its Analysis to Peer Review
The Vaccine Safety Datalink uses data reported from nine large healthcare organizations, serving only 3% of the U.S. population. The system collects electronic health data from each participating site.CDC Morbidity and Mortality Weekly Reports can, as in the case of the agency’s analysis of COVID vaccine safety in pregnant women, be based on data that is not necessarily publicly available.
Conclusions
The CDC’s determination that COVID vaccination is safe in pregnant women is unfounded.Cohorts were poorly matched. There was an inexcusably low representation of women who were vaccinated early in their pregnancy in their analysis. This is a period where any exposure to medical interventions will have a greater potential for risk to the fetus.
Broadly recommending vaccination for all pregnant women including those who are trying to become pregnant is particularly unwarranted.
This report places the CDC’s purported commitment to its mission of disease control and prevention on full display. The agency’s conclusions arrive more than a full year after the CDC authorized COVID vaccinations and are based on retrospective data alone.
In other words, the CDC is willing (and apparently allowed) to make safety determinations only after the experimental vaccines have been widely and indiscriminately deployed.
This is a shocking departure from the higher standards of prudence that are demanded during pregnancy, a time where two lives are potentially at risk and poor outcomes can lead to a lifetime of potential consequences.
It should be noted that several of the authors of this study reported potential conflicts of interest.
