CD40LG and COVID-19: In a meta-analysis of COVID-19 serology tests that included 40 studies, the pooled sensitivity of IgG or IgM ELISA was 84.3% (95% confidence interval, 75.6% to 90.9%), for LFIAs it was 66.0% (49.3% to 79.3%), and for CLIAs it was 97.8% (46.2% to 100%).