Prevalence in China
Local hospitals in Wuhan, China reported on 31 December 2019 that a group of cases were infected by corona virus [1] On 9 January 2020 WHO identified the causative agent of these infections as ”2019-nCoV”.[2] At the same date, Huanan seafood market was identified as the site of elementarily exposure event, then on 1 January 2020 this market was closed and several studies proposed that bats may be the potential reservoir of SARS-CoV-2, knowing that recently these bats considered a natural reservoir of MERS-COV and SARS-COV viruses [3, 4].
On 2 January 2020, 41 patients were admitted to the hospitals as having laboratory-confirmed COVID-19 infection, less than half of these patients had hypertension, diabetes and cardiovascular disease. [5]
On 14 February 2020 , Guan WJ et al ; reported the most commonly method for transmission of COVID-19 in China and it was divided into: 31.3% of patients travelled to Wuhan recently,72.3% of patients contacted with people non-residents of Wuhan, and 3.8% of the patients infected with corona virus were healthcare workers. [6]
All available evidence indicates that corona-virus is transmitted by cough and vomit droplets of patients and reach to nose, eyes or mouth of healthy people. However , when heavy droplets had landed on surfaces, other people may be in close contact with these contaminated surfaces and touched their mucous membranes. [5, 7]
On 26 March 2020, WHO reported that total confirmed cases in China reached 81961 and total deaths were 3293 and the transmission classification of COVID-19 between patients was local transmission [8]
World Health Organization (WHO) still recommend that we have to wash our hands frequently, clean and decontaminate surfaces, also keeping the social distancing of people with fever or respiratory symptoms, which will limit viral transmission. It also recommendation to use medical masks for those who deal with COVID-19 patients such as FFP2 or FFP3, N95 masks. [9]