A study published Thursday reaffirms the evidence that not all Covid shots are made equal, as some batches result in greater rates of serious adverse events (SAE) than others, confirming an earlier study on the topic.
“The authors analysed the number of adverse events (AEs) reported in connection with various batches of COMIRNATY vaccine in Denmark. In almost 11 million doses of 52 different BNT162b2 vaccine batches adminis- tered to approximately 4 million Danish individuals, they analysed approx. 43,000 AEs, finding batches with up to .1 reported AEs per dose as well as those with less than .0001 AEs per dose. Interestingly, the high-AE batches were all small (up to 100,000 doses), while the low-AE batches were much larger,” the study said in the ‘Introduction’ section.
Interestingly, batches released earlier in the vaccination campaign resulted in greater rates of adverse events.
NEW STUDY – High Variability in Adverse Event Reports Among COVID-19 Vaccine Batches
A new study reveals a significant variability in the number of adverse event reports associated with different batches of COVID-19 vaccines from various manufacturers, aligning with trends… pic.twitter.com/AjRPR1Q9yl
— McCullough Foundation (@McCulloughFund) June 28, 2024
A study from last year demonstrated the same phenomenon as well.
“The observed variation in SAE rates and seriousness between BTN162b2 vaccine batches in this nationwide study was contrary to the expected homogenous rate and distribution of SAEs between batches,” the study said. “Compared to the rates of all SAEs, serious SAEs and SAE-related deaths per 1.000 doses were much less frequent and numbers of these SAEs per 1000 doses displayed considerably greater variability between batches, with lesser separation between the three trendlines (not shown).”
The researchers in the 2023 study provided a chart showing various batches and their corresponding adverse events.
https://onlinelibrary.wiley.com/doi/10.1111/eci.13998
