title: WITHDRAWN: Annales de l'Institut Pasteur.
abstract: This article has been withdrawn consistent with Elsevier Policy on Article Withdrawal. (http://www.elsevier.com/locate/withdrawalpolicy). The Publisher apologizes for any inconvenience this may cause.
authors.affiliation: Institut Pasteur, Paris, France.
authors.forename: Camus
authors.initials: C
authors.lastname: Geraldine