Abstract: Objective To examine the IgG and IgM antibodies for parasites Cysticercus cellulosae and Toxoplasma gondii in 122 patients with meningitis encephalitis syndrome, and provide basis for clinical diagnosis of the meningitis encephalitis syndrome. Methods The sera were collected from patients with meningitis encephalitis syndrome in Shanghai Jiaotong University Affiliated Sixth People’s Hospital, People’s Hospital of Danyang City, and Jiangsu University Affiliated Hospital from August, 2014 to December, 2015. Serum IgG and IgM antibodies for cysticercus and T. gondii were examined using antibody test kits. The antibody positive rate was calculated and its distribution was analyzed by gender, season, age and occupation. Results A total of 122 patients with meningitis encephalitis syndrome were included. Seventeen and 22 patients of them were positive for IgG （13.9%, 17/122） and IgM（18.0%, 22/122） against cysticercus, respectively, while 29 and 8 cases were positive for IgG （23.8%, 29/122） and IgM （6.6%, 8/122） against T. gondii. The positive rate of cysticercus and T. gondii in males was 30.6%（22/72） and 31.9%（23/72） respectively, while that in females was 26.0%（13/50） and 24.0% （12/50）. The positive rate of IgM against cysticercus was 12.0%（3/25）, 27.0%（17/63）, 6.9% （2/29）, and 0（0/5） from spring to winter, highest within 13-25 years（45.0%, 9/20） among age groups, and highest in workers（7/14） among various occupations. The positive rate of IgM against T. gondii was 4.0%（1/25）, 11.1% （7/63）, 0（0/29）, and 0（0/5） from spring to winter, highest in ages >65 years（44.0%, 11/25）, and highest in patients with other occupations（4/10）. There was no statistically significant difference in the positive rate between males and females, and among different seasons, ages and occupations. Conclusion The positive rate of antibodies against cysticercus and T. gondii is high in the patients included, suggesting that a serological test for parasite infection might be performed during clinical diagnosis of meningitis encephalitis syndrome.

Key words: Meningitis encephalitis syndrome, Cysticercus cellulosae, Toxoplasma gondii, Serum, Antibody