How many {prevalence} are for {tuberculosis} ?
How prevalent is TB?
What is the prevalence of tuberculosis?
SELECT ( COUNT ( ?p ) AS ?s ) { resource:tuberculosis property:prevalence ?p }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12204> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1193> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q12204 wdt:P1193 ?obj }
7