Today, Pfizer/BioNTech announced analysis that showed over 90% effectiveness of their coronavirus vaccine, currently in Phase III clinical trials. There are over 43,000 people around the world enrolled in this study, including spouse B, daughter T, and me. My most recent post on the trial is here.
That is an extraordinarily high percentage for a vaccine; for comparison, most years, the seasonal flu vaccine is about 50% effective. Lest you think that Pfizer or BioNTech are exaggerating the data, neither company did the analysis. That was accomplished by an independent science review board.
While this is welcome news, there are some cautions involved. The number of cases of COVID among the large study group is still small; as time goes on, it’s possible that the efficacy rate might drop. Because the virus and the vaccine are so new, there is no way to know how long immunity might last. This is part of the reason that the study is set to last for two years, so more data can be collected about the long-term efficacy, longevity, and safety of the vaccine.
Besides the speed with which this vaccine was developed, the remarkable thing is that this is among the first messenger RNA vaccines to be tested in a large trial. If it is shown to be safe and effective, there are hopes that the Moderna vaccine, also currently in Phase III trials and an mRNA vaccine, may be effective as well. Additionally, there are vaccines that were developed in more traditional ways in Phase III trials. The more vaccines that are shown to be safe and effective, the more people can be vaccinated in a shorter timeframe, so that we can bring the global pandemic to an end, perhaps as early as late 2021 or early 2022.
It’s possible that Pfizer will be able to apply for emergency use authorization in the United States later in November, after there is two months of safety data from half the study participants after their second dose. This, along with manufacturing safety data and the efficacy numbers, will be considered by the Food and Drug Administration to determine if the vaccine can begin to be distributed, with full approval coming after more data is collected.
It’s worth noting that Pfizer/BioNTech have a contract to provide 100 million doses to the United States government if the vaccine is approved. Unlike some other companies, though, Pfizer and BioNTech did not take money from the US for their research and trial expenses. The contract is for $1.95 billion but the US government will distribute it free of charge.
My hope is that this and several other vaccines will be approved over the next few months so that as many people as possible can be protected as quickly as possible, starting with frontline health workers, first responders, and those most vulnerable due to age, underlying conditions, living facilities, and occupation.
We got the sad news today that there are several people in the skilled nursing unit of Paco’s senior community who have tested positive for the virus. Access to the unit had already been restricted, so there is hope that it will not spread any further, but we are all worried about those impacted.
The sooner we have vaccines – and better treatments – the better.