RETRACTION
Volume 42, no. 12, p. 5885–5888, 2004, https://doi.org/10.1128/JCM.42.12.5885-5888.2004. We were alerted that lanes 2 and 6 of Western blot strips in Fig. 2A are more similar than expected on retrospective inspection under magnification. The lapse of 18 years since the publication of this paper made investigation using original research material impossible. We therefore voluntarily take the step of retracting this paper to set the scientific record straight.