“…The routine techniques performed on these two sera revealed low levels of IgG (with a slight interim increase) but no IgM. The serological methods used have already been described (1). Briefly, specific IgG antibodies were detected by using both Vidas TXG (bioMérieux, Marcy l'Etoile, France) and indirect immunofluorescence assay (IFA), while IgM antibodies were detected by using Vidas TXM, ImmunoSorbent Agglutination Assay (Toxo-ISAGA; bioMérieux, Marcy l'Etoile, France) and IFA.…”