 As the COVID-19 virus mutates into different variants, one small-cap diagnostics company says their test can detect the mutated strains: T2 Biosystems. T2 Biosystems soared as much as 49 in Tuesday pre-market trades after it said its T2SARS-CoV-2 Panel proved effective in identifying variants of COVID-19 that are spreading quickly in the UK, South Africa, and the US. 