Time-series analysis: variation of anti-acetylcholine receptor antibody titer in myasthenia gravis is related to incidence of Mycoplasma pneumoniae and influenza virus infections

Iwasa, Kazuo; Yoshikawa, Hiroaki; Hamaguchi, Tsuyoshi; Sakai, Kenji; Shinohara-Noguchi, Moeko; Samuraki, Miharu; Takahashi, Kazuya; Yanase, Daisuke; Ono, Kenjiro; Ishida, Chiho; Yoshita, Mitsuhiro; Nakamura, Hiroyuki; Yamada, Masahito

doi:10.6084/m9.figshare.5632615

yner_a_1407021_sm1896.docx (11.28 MB)

Time-series analysis: variation of anti-acetylcholine receptor antibody titer in myasthenia gravis is related to incidence of Mycoplasma pneumoniae and influenza virus infections

journal contribution

posted on 2017-11-25, 07:31 authored by Kazuo Iwasa, Hiroaki Yoshikawa, Tsuyoshi Hamaguchi, Kenji Sakai, Moeko Shinohara-Noguchi, Miharu Samuraki, Kazuya Takahashi, Daisuke Yanase, Kenjiro Ono, Chiho Ishida, Mitsuhiro Yoshita, Hiroyuki Nakamura, Masahito Yamada

The exacerbating factors of myasthenia gravis (MG) are unknown. However, it has been speculated that infections may play a role in disease progression.

We calculated the adjusted anti-acetylcholine receptor antibody (Adj-AChR-Ab) titers (range, 0–1) in 58 MG patients between 2006 and 2012. We determined the relationship between Adj-AChR-Ab titer and infection incidence.

A cross-correlation function (CCF) analysis of Adj-AChR-Ab titer and incidence of Mycoplasma pneumoniae (M. pneumoniae) (r = 0.449, P < 0.0001) and influenza virus (r = 0.411, P < 0.001) infections indicated significant correlations. MG with thymoma was highly correlated with M. pneumoniae infection (r = 0.798, P < 0.0001). The relative risk for Adj-AChR-Ab titer was 1.407 for M. pneumoniae (95% CI, 1.193–1.661 for an increase in one infected patient per monitoring point) and 1.158 for influenza (95% CI, 1.071–1.253 for 100 infected patients).

Variation of Adj-AChR-Ab titer is significantly influenced by the presence of M. pneumoniae and influenza virus infections.