| Abstract: | In the patients with pityriasis rosea (Gibert), who came to our hospital in the period from November of 1979 to May of 1981, cold hemagglutinin (CHA), complement fixation (CF) and indirect hemagglutination (IHA) antibodies against Mycoplasma pneumoniae were observed. In 6 out of 30 cases, the CF titer was 1: 32 or higher and CHA 1: 128 or higher, indicating the presence of Mycoplasma pneumoniae infection; 22 cases were serologically positive and only 8 cases were negative for Mycoplasma pneumoniae. These results suggest that cases with pityriasis rosea may possibly be caused by Mycoplasma pneumoniae infection, although not all cases are serologically positive. |
