AHR and COVID-19: Viral pathogens such as Zika virus (ZIKV) and Dengue virus (DENV) exploit AHR signalling to enhance replication and evade host defences, and emerging data suggest a similar mechanism in SARS-CoV-2 infection (Hu et al., 2023; Giovannoni et al., 2021; Shi et al., 2023).