<p>Meningococcal LPS was analyzed by immuno dot blots. The isolates were obtained from invasive disease (German reference laboratory for meningococci) and healthy carriers <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045132#pone.0045132-Claus1" target="_blank">[28]</a>, respectively.</p