10 January 2026
: Case report 
Persistent SARS-CoV-2 Infection in an Immunocompromised Host Treated Successfully With the Japanese Herbal Medicine, Mao-to: A Case Report
Unusual clinical course
Takayuki Yamada EF 1, Shiro Sonoda AD 1*, Mitsuki Otsuka CD 1, Tsuyoshi Shirai BE 1, Tomoya Tateishi
ABC 1, Haruhiko Furusawa DEF 1, Yasunari Miyazaki ACD 1
DOI: 10.12659/AJCR.950221
Am J Case Rep 2026; 27:e950221
Figure 1 Clinical course during COVID-19 treatment. Each bar indicates the duration of drug use. Red circles indicate positive test results for SARS-CoV-2 antigen. SARS-CoV-2 PCR Ct values are shown as the line in the graph. Red arrows indicate the inpatient period, and red arrowheads indicate outpatient visits. COVID-19 – coronavirus disease 2019; SARS-CoV-2 – severe acute respiratory syndrome coronavirus 2; PCR – polymerase chain reaction; Ct – cycle threshold.