The Wall Street Journal reports (behind paywall) some of us have immune systems that are primed to fight corona virus even before we're exposed to it.
The emerging theory: Exposure to other coronaviruses earlier in life helps some individuals fight the new intruder.
That T-cells can recognize similar viruses years after infection suggests long-lasting immunity might be possible.
This thinking, if accurate, makes a future immunization more valuable than flu shots which are needed yearly and often miss the mark. If long-lasting, perhaps one shot will be good for decades? FYI, some versions of the common cold are corona viruses.