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user93037
There's some cross-reactivity with other corona strains with some of the tests currently being evaluated. Which is why they're not in full use yet (at least not here in Sweden). We'll be collecting samples from known cases with mild symptoms during the following days/weeks as they're unsure of how to interpret the results from samples from ICU patients who are super sick. The lack of known cut off values for antibody levels is a problem. When is it safe to say a person is immune?