Here is some hopeful news concerning coronavirus. A number of studies are looking into our immune systems response to the disease. Several of these studies are in their early stages and haven't been reviewed yet but they're giving some encouragement that our bodies are learning to detect coronavirus and work to keep people who've been infected from getting sick again. A couple of these studies looked at T cells, important parts of our immune system that can attack and kill cells that are infected.
One study of blood samples found that between 20% and 50% of Americans in some places may have T cells that recognize coronavirus even if they've never been diagnosed with it. Scientists don't know why. It might be a response to other coronaviruses that we've caught like the common cold. They also don't know if recognizing COVID-19 means the cells are good at finding it. But they're optimistic about the findings.
Another study looked at the antibodies produced in response to and protection against coronavirus. It found that our antibodies maybe good at fighting a recurrence of the disease for at least four months after people first become infected.
There've been a number of cases where people testing positive for COVID-19 more than once but researchers say they haven't seen huge numbers of reinfection even though the virus is widespread. So this suggests the body's immune system is working to protect us from catching it multiple times. But this hasn't been proven yet. Scientists say time will tell when it comes to coronavirus immunity.