<http://webisa.webdatacommons.org/prov/274449482>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/120753338> .
<http://webisa.webdatacommons.org/120753338>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<plos.org> .
<http://webisa.webdatacommons.org/120753338>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/120753338>	<http://www.w3.org/ns/prov#value>	"Infants are particularly susceptible to the disease because of less developed immunity but if they survive repeated infections over many years, a degree of protective but non-sterilising immunity can be attained by several years of age." .