There remains some confusion around new research from the University of Oxford in the United Kingdom that compares the risk of a rare type of blood clot among people who have had Covid-19 with people who received the AstraZeneca, Moderna and Pfizer vaccines, Dr. Anthony Fauci said.
Fauci who is director of the National Institute of Allergy and Infectious Diseases made the comments during a hearing with the House Select Subcommittee on the Coronavirus Crisis Thursday.
"They were trying to find out the difference in the incidence of thromboses, particularly cerebral venous thromboses, following the disease Covid-19 compared to various vaccinations, including influenza as well as the mRNA vaccines of Pfizer as well as Moderna," Fauci said. "They found that – as you might expect – following the disease, you get a very marked increase in the incidence of this adverse situation of cerebral venous thrombosis."
However, Fauci added that when the researchers calculated what the incidence of these thromboses may be following Covid-19 vaccination to compare incidents following different types of vaccines, some concerns in the methodology emerged.
"It is impossible, the way this study was designed and conducted to make that determination. So, I believe when this paper, which is in a pre-print server, gets submitted to the classical scientific journals and undergoes peer review that that confusion will be straightened out," Fauci said.
"It will be clear that you cannot make any statement, the way this is designed, about the adverse events following the vaccination with the mRNA comparing to anything else," Fauci said.
"There were many, many, I would say, procedural gaps in here regarding the way the study was done. It was a well-meaning attempt to show that Covid-19 disease is followed by this complication, but they led to some suggestions that I think are not called for in the paper."