About: http://webisa.webdatacommons.org/8730087

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I would get restested because unless you just had the antibodies at the first test and never had a PCR or any other test done then - maybe you did have it but killed it - or maybe the second test is a mistake.
http://www.w3.org/ns/prov#wasQuotedFrom	medhelp.org