“…In contrast, in patients with recurrent herpes labialis the specific IgG and IgA antibodies were not found to fluctuate significantly during the course of infection (Fig.1). These results are in agreement with previous studies that have shown that serum HSV neutralizing antibodies may fluctuate after primary infection but remain usually high and constant after recurrent infection [Docherty and Chopan, 1974;Shore and Nahmias, 1982;Klein, 1982;Sarov, 19841. A significant rise of HSV IgG antibodies was seen, however, in some cases of HSV encephalitis and in severe cases of recurrent mucocutaneous lesions [Kalimo et al, 19771.…”