If you're a healthcare worker, the cost of a false-positive could be high. For them and others one cost is that they'll feel themselves somewhat immune when th

If you're a healthcare worker, the cost of a false-positive could be high. For them and others one cost is that they'll feel themselves somewhat immune when they're not and may not take precautions. It will also confuse study of the disease if it starts to look like your "2nd" infection can be much worse than your first.