- Aberrant IgG subclass distribution to measles in healthy seropositive individuals, in patients with SSPE and in immunoglobulin-deficient patients. Mathiesen, T., Hammarström, L., Fridell, E., Linde, A., Wirsen, G., Smith, C.I., Norrby, E., Wahren, B. Clin. Exp. Immunol. (1990)