<![CDATA[Acute respiratory infections (ARIs), including those caused by Human Metapneumovirus (HMPV), remain a global health concern, and no specific therapy or vaccine is currently available. Hesperidin, the main flavonoid in Garut orange peel (Citrus nobilis var. chrysocarpha), is known for its anti-inflammatory, antiviral, and immunomodulatory activities. This study was an in vivo pilot study using 35 male Balb/c mice divided into seven groups: normal control, negative control (5% imiquimod), positive control (levamisole), and hesperidin-treated groups at 50, 100, and 150 mg/kg body weight, either alone or in combination with imiquimod. Observed parameters included total leukocytes, lymphocytes, neutrophil-to-lymphocyte ratio (NLR), body weight, organ weight, and lung histology. Hesperidin was extracted using 70% ethanol and identified by thin-layer chromatography (TLC).Results showed that body weight data were normally distributed, with no significant differences between groups (p > 0.05), indicating that hesperidin was safe at the tested doses. Hematological analysis revealed significant differences in leukocyte counts (p = 0.001), lymphocytes (p = 0.002), and NLR (p = 0.001). Imiquimod induced systemic inflammation, as evidenced by increased leukocytes, lymphocytes, NLR, and lung inflammation scores. Hesperidin exhibited dose-dependent immunomodulatory effects; the 100 mg/kgBW dose combined with imiquimod produced the most optimal results, characterized by low NLR and a histology score of 0, reflecting controlled inflammation and effective adaptive immune activation. In contrast, the 150 mg/kgBW dose triggered excessive inflammatory responses.]]>
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