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Actually, when someone catches a viral disease, if you had a good test for the presence of the virus, and tested someone several times every day, you would expect all the test to detect virus during days when person was sickest. Then as they recovered and the amount of virus dropped, at some point the amount of virus would drop to about what test can detect reliably. At that point if you did multiple tests each day, some would be positive and some wouldnt. If you did just one test per day, todays might be negative and tomorrows positive. Several days later, after there was even less virus, the tests would then all be consistently negative.This is what will happen in Washington. Since we got out in front of it and locked everything down to flatten the curve, we will "open up" earlier than other states. We will experience a rebound because none of us have immunity.
Apparently some of the tests distributed early on might have been unreliable. In addition, people are mostly just being tested once. Also, there are some reports that people might carry and be shedding virus before and after they have symptoms. Also, people can relapse.
So where there is a report that someone was cured and then caught virus again, this could be problems with testing. Basically, I dont think we yet know whether you develop immunity.