Usually the illness begins with a fever, followed by a dry cough.
After a week, the disease can lead to shortness of breath and some patients need hospital treatment. Notably, the corona virus rarely causes a runny nose or sneezing.
According to the World Health Organization (WHO), the incubation period – the period between being infected with the virus and having obvious symptoms – can last up to 14 days.
But some other researchers suggest that the incubation period can be as long as 24 days.
At the same time, Chinese scientists say some people may be infected with the virus before the symptoms of the disease appear.
How deadly is corona virus?
Based on data from 17,000 patients infected with corona virus, WHO said:
82% develop mild symptoms
15% develop severe symptoms
3% is seriously ill
The mortality rate for this disease named Covid-19 was recorded quite low (from 1% to 2%). However, these figures are not reliable.
Thousands of people are being treated but at risk of death. Therefore, the death rate for corona virus may be higher.