In a recent study posted to the medRxiv* server, a team of researchers investigated how antigen concentration and viral load in different specimen types affected the performance of severe acute ...

The enzyme-linked immunosorbent assay (ELISA) is a plate-based technique that researchers use to quantify the levels of different molecules within a sample, including proteins, peptides, hormones, or ...

Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...