Existing coronavirus vaccines are not as effective against newer variants of the virus. Two vaccine experts explain how new vaccines currently in development will likely offer better protection.
There’s not enough evidence yet to support the AstraZeneca CEO’s statement. But it is theoretically plausible.
Viral vectors are modified viruses that trigger an immune response without causing infection. The vector that’s used in several COVID-19 vaccines was created decades ago by Canadian Frank Graham.
What kind of vaccine is Sputnik V, how does it work, and what data are we missing?
Various companies use different ingredients and different delivery systems in their COVID-19 vaccines. Researchers are investigating whether it’s better for individuals to mix what’s available.
The CDC first paused, then unpaused, the administration of the Johnson & Johnson COVID-19 vaccine due to concerns about blood clots. But what are those clots, and how do they form?