“Middle-high level of RF-IgM could lead to false-positive reactivity of SARS-CoV-2 IgM “ As more people want SARS-CoV2 antibody testing, I am afraid this will give people a false sense of security ⁦@RheumNow⁩ ⁦@ACRheum⁩ NCBI - NLM - NIH https://t.co/vkjWRJQV27