In a 1988 essay on pandemics Joshua Lederberg, Nobel laureate and president of The Rockefeller University, reminded the medical community that when it comes to infectious disease, the laws of Darwin are as important as the vaccines of Pasteur.

As medicine battles bacteria and viruses, those organisms continue to undergo mutations and evolve new characteristics.

Lederberg advised vigilance: “We have no guarantee that the natural evolutionary competition of viruses with the human species will always find ourselves the winner.”

Continue reading “The Virus Won’t Stop Evolving When the Vaccine Arrives” →

This month has seen a torrent of news about experimental vaccines to prevent Covid-19, with the latest development from AstraZeneca and the University of Oxford. On Monday they announced that a preliminary analysis showed their vaccine was effective — especially when the first dose was mistakenly cut in half.

The announcement came on the heels of stunning reports from Moderna, as well as Pfizer and BioNTech. But AstraZeneca’s news was murkier, leaving many experts wanting to see more data before passing final judgment on how effective the vaccine may turn out to be.

Continue reading “What We Know About AstraZeneca’s Head-Scratching Vaccine Results” →

The front-runners in the vaccine race seem to be working far better than anyone expected: Pfizer and BioNTech announced this week that their vaccine had an efficacy rate of 95 percent. Moderna put the figure for its vaccine at 94.5 percent. In Russia, the makers of the Sputnik vaccine claimed their efficacy rate was over 90 percent.

“These are game changers,” said Dr. Gregory Poland, a vaccine researcher at the Mayo Clinic. “We were all expecting 50 to 70 percent.” Indeed, the Food and Drug Administration had said it would consider granting emergency approval for vaccines that showed just 50 percent efficacy.

Continue reading “2 Companies Say Their Vaccines Are 95% Effective. What Does That Mean?” →