Abstract Middle East respiratory syndrome coronavirus (MERS-CoV) is an emerging coronavirus that can cause zoonotic disease in humans with lethal severe viral pneumonia . Dromedary camels are the source of zoonotic infection. As of November 2025, MERS-CoV has resulted in a total of 2630 reported cases, 37% of these being fatal . The number of reported human cases has been on a decreasing trend since 2016 and reached a nadir during the COVID-19 pandemic . The reason for the reduction of cases is unclear and may be multifactorial. We hypothesized that mutations accumulating in the virus spike protein may have reduced zoonotic potential . Here, we investigate the impact of recently emerged virus spike-protein mutations on virus replication competence using pseudoviruses and replication-competent recombinant viruses. We found that virus spike variants detected in 2019 and some from 2023 show a reduced cell entry, lower viral replication and reduced fitness in human primary alveolar e...
Risk statement -- The scope of this Rapid Risk Assessment is to reassess the epidemiological situation of Middle East respiratory syndrome coronavirus ( MERS-CoV ) following the recent exportation (in December 2025) of cases from the Arabian Peninsula to France and three healthcare-associated clusters reported by the Kingdom of Saudi Arabia (KSA) in 2024–2025. -- These events, together with the continued occurrence of sporadic cases in Arabian Peninsula countries, highlight the ongoing risk of international spread to non-endemic countries and reflect the persistent circulation of MERS-CoV in the Middle East . -- Middle East respiratory syndrome coronavirus (MERS-CoV) is a zoonotic virus transmitted to humans through direct or indirect contact with infected dromedary camels , which are the natural host of the virus. -- First identified in humans in 2012 in the Kingdom of Saudi Arabia (KSA) and Jordan , MERS-CoV causes a viral respiratory infect...