Antigen for 2019 novel Coronavirus and detection use thereof

A kit, which comprises a detection reagent and a capture reagent,

• wherein the detection reagent and capture reagent are each independently selected from the group consisting of (i) an isolated polypeptide and (ii) a fusion protein comprising the isolated polypeptide and an additional polypeptide;
• wherein the isolated polypeptide consists of the sequence shown in SEQ ID NO:
• 1;
• and wherein the detection reagent bears a detectable label.