About: http://webisa.webdatacommons.org/29158455

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	Of course, 50 percent effectiveness is far less than the 90 percent-plus protection offered by established vaccines against polio, measles, whooping cough, tetanus and other infections.
http://www.w3.org/ns/prov#wasQuotedFrom	kenw.org