A convenient, low-cost blood test for Covid-19 has been developed by scientists in Wales.
Dried blood spot (DBS) samples have been used since the 1960s to test newborn babies for inherited disorders.
The antibody test puts a single drop of blood from a skin prick onto specialized filter paper cards which can be sent for laboratory testing.
Experts from the University Hospital of Wales (Newborn Screening, Immunology, Point of care testing, ICU and Haematology), Cardiff University (Immunology and Clinical Innovation) and the Welsh Blood Service have now developed DBS methods for testing Covid-19 antibodies in adults.