“An expatriate living in Qatar has died of [Middle East respiratory syndrome coronavirus (MERS-CoV)], bringing to four the number of deaths in the Gulf state from the coronavirus, health authorities said on Friday,” Agence France-Presse reports. “Experts are struggling to understand the disease, for which there is no vaccine,” the news agency writes (11/22). In a report released on Friday, the WHO “said … the continuing outbreak of [MERS-CoV] cases is probably being sustained, as some researchers have suggested, by a combination of human-to-human transmission and spillover from animals or other non-human sources — not one or the other,” CIDRAP News reports. “The agency’s current MERS-CoV count is 157 confirmed and 19 probable cases, for a total of 176. With 69 deaths, the case-fatality ratio is 39.2 percent,” the news service writes (Roos, 11/22).