Some infected with the novel coronavirus never develop symptoms. Others get very sick and die. Seven months into the pandemic, scientists are racing to find out why.
There are theories. One theory is that prior exposure to other viruses may help fight off the novel coronavirus. There are four other, far less deadly coronaviruses which cause the common cold.
Earlier this summer, researchers from La Jolla Institute for Immunology published new findings in the journal Cell, offering insight into how human immune systems respond to COVID-19. When people who were previously infected with COVID-19 were exposed to the virus again, their immune system had a strong response because it already knew what the virus looked like.
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