Immunity acquired from infection and various vaccines not only affords varying protection but wears off at different rates.
Six months of COVID vaccines: what 1.7 billion doses have taught scientists
At a pivotal moment in the pandemic, Nature explores key questions about the vaccines that countries are racing to deliver while viral variants spread around the globe.
According to Hesiod, when Prometheus stole fire from heaven, Zeus, the king of the gods, took vengeance by presenting Pandora to Prometheus’ brother Epimetheus. Pandora opened a jar left in her care containing sickness, death and many other unspecified evils which were then released into the world. Though she hastened to close the container, only one thing was left behind – Hope.