Moderna Inc. and another from Pfizer Inc. and BioNTech SE, are highly protective against the spread of the virus in addition to symptoms, and another from AstraZeneca Plc does a reasonably good job.1.
Why is this important?While getting vaccinated gives people considerable insurance against falling ill with Covid, which is sometimes fatal, if they can still get silently infected with SARS-CoV-2, they might pass it on, potentially sickening people who aren’t immune.
Those who are infected but never develop symptoms are responsible for 24% of transmission, one study estimated. The more SARS-CoV-2 circulates, the more opportunity the virus has to mutate in ways that enhance its ability to spread, sicken and kill people, and evade the immunity.