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Quote: سرعة أنتشار المرض How contagious is the Wuhan Coronavirus؟ (Ro) The attack rate or transmissibility (how rapidly the disease spreads) of a virus is indicated by its reproductive number (Ro, pronounced R-nought or r-zero), which represents the average number of people to which a single infected person will transmit the virus. WHO's estimated (on Jan. 23) Ro to be between 1.4 and 2.5. [13] Other studies have estimated a Ro between 3.6 and 4.0, and between 2.24 to 3.58. [23]. Preliminary studies had estimated Ro to be between 1.5 and 3.5. [5][6][7] An outbreak with a reproductive number of below 1 will gradually disappear. For comparison, the Ro for the common flu is 1.3 and for SARS it was 2.0. سرعة الفتك بالمريض Fatality Rate (case fatality ratio or CFR) of the Wuhan Coronavirus See full details: Coronavirus Fatality Rate The novel coronavirus' case fatality rate has been estimated at around 2%, in the WHO press conference held on January 29, 2020 [16] . However, it noted that, without knowing how many were infected, it was too early to be able to put a percentage on the mortality rate figure. A prior estimate [9] had put that number at 3%. Fatality rate can change as a virus can mutate, according to epidemiologists. مقارنة بالأنفلوزنا والسارس For comparison, the case fatality rate for SARS was 10%, and for MERS 34%. مدة حضانة المرض Incubation Period (how long it takes for symptoms to appear) See full details: COVID-19 Coronavirus Incubation Period Symptoms of COVID-19 may appear in as few as 2 days or as long as 14 (estimated ranges vary from 2-10 days, 2-14 days, and 10-14 days, see details), during which the virus is contagious but the patient does not display any symptom (asymptomatic transmission).