query: #added before 2016-10
  
  SELECT DISTINCT ?item ?label
  WHERE
  {
    ?item wdt:P31 wd:Q13442814;
          rdfs:label ?label.
    FILTER NOT EXISTS {?item wdt:P921 ?topic.}
    FILTER(CONTAINS(LCASE(?label), "virus")).
  }
  LIMIT 100