The incubation time is the time from transmission until symptoms appear. World Health Organization (WHO) has estimated the incubation time for the coronavirus to be 5-6 days, but this can vary from 0 to 14 days.
Symptoms resemble those with colds and influenza.
- Fever, a sore throat and coughing.
- Some people develop breathing difficulties and pneumonia.
People who become ill typically experience initial upper respiratory tract symptoms (sore throat, cold symptoms, mild cough), as well as feeling generally unwell and having muscle pain. Diarrhoea may occur but is not common.
The course of the disease can vary widely between individuals. Currently, the typical courses appear to be:
- Mild course (this applies to the majority of those who become ill, about eight out of ten): Symptoms pass within one to two weeks and there are rarely a need for treatment from the healthcare service.
- Moderate course: After 4-7 days of mild symptoms, some people may experience breathing difficulties, worsening cough and a rising fever. If you experience breathing difficulties, you should contact your doctor. Some will need to be admitted to hospital.
- Severe course: As for the moderate course, but these people also need intensive care treatment. They may have symptoms for 3-6 weeks. Some of those who become severely ill will die from the disease.
Information about risk factors for severe disease is currently limited. Admission to hospital, intensive care treatment and death are more common among the elderly and people with underlying diseases. Particularly elderly people with underlying diseases are at risk, but severe illness can also occur among people without known risk factors.
There is no specific treatment or vaccine for the disease, but hospitals in Norway have started registering patients with confirmed coronavirus infection in the Norwegian pandemic register (Norsk pandemiregister) to allow for improvements in treatment and follow-up. You can find more information about the Norwegian pandemic register here (in Norwegian).
Clinical trials for COVID-19 (in Norwegian):
The difference between symptoms of coronavirus and pollen allergy
During the months of spring, many people in Norway are affected by pollen allergy. The symptoms can resemble those of a coronavirus infection, such as a runny nose, sneezing, runny or itchy eyes and some also experience asthmatic distress. However, pollen allergy does not bring about symptoms such as a sore throat, body aches or fever that can be seen with coronavirus.
Can the virus be transmitted by people who do not display any symptoms?
- While the most typical route of transmission is via a person who displays symptoms, infection can also occur prior to symptoms developing.
- If you are ill, stay at home.