Some of the people who came into contact with the COVID-19 cases had no symptoms, so it is very important to quarantine them at home.
It is likely that a person who has recovered from COVID-19 is immune and cannot be reinfected for a period of time. Researchers can test people who recover from it in the weeks or months after infection to see if they are still immune. It is still under investigation whether transmission occurs when people do not have symptoms, or whether some people who test positive for the virus but never develop symptoms could be infectious.
Rasmussen said that even if people became immune, we don't know how long that immunity would last. Reininfection is possible, he said, but only in cases of serious infection, such as the one caused by Covid-19.
The only way to find out if someone is asymptomatic is if they test positive for the virus but never show symptoms.
Asymptomatic individuals can actually spread the virus, but the extent to which this happens is still under investigation. A more comprehensive test for symptoms in the community would help people know what percentage of people could get the disease and help prevent further spread, the researchers said. It would also help researchers understand how many asymmetric cases there are and whether they carry the viruses.
It is possible that the virus can also be spread through contact with contaminated surfaces, but according to the CDC, this is not considered a major route of transmission.
The incubation period of the coronavirus seems to be between two and 14 days, i.e. the time that elapses between infection with the virus and the onset of symptoms. The average time it takes a person to show symptoms is about five days, according to the World Health Organization.
You don't get sick in the early stages, and some people may never develop symptoms, but a person can spread the coronavirus even if they don't have symptoms.
On average, it takes five days after the first symptoms appear, but this varies widely and varies greatly by age, race, gender and other factors such as age and gender.
The main symptoms are fever and cough, but these are the result of an immune system response to the infection. In some cases, an excessive immune response in people with COVID-19 has been successfully treated with drugs that suppress the immune system. It is so effective that eight out of ten people who get it recover within days, often without symptoms.
Some studies have shown that people with COVID-19 have a high viral load when they get sick for the first time, but they forget the symptoms. This indicates that it can be transmitted even if you get it while you are before - symptomatic.
The other case is known as asymptomatic spread, in which the individual is contagious but never develops symptoms. This is called presymbolic spread because it means that the person who develops symptoms continues to develop symptoms, but there are some cases where they are able to pass them on.
According to the CDC, an estimated 35 percent of those infected are asymptomatic, and this could account for up to a quarter of transmission of the virus.
One of the tricky things is that these symptoms also apply to the flu, but in the United States is still flu season, so most people with symptoms now probably don't have COVID-19. A study published in April in the journal Nature found that those who struggled with flu symptoms such as fever, chills, headaches, muscle aches and fatigue were the most contagious.
But other respiratory diseases caused by rhinoviruses, enteroviruses and other viruses don't necessarily have fever, says Dr. Michael D. Schmitt, a professor of infectious diseases at the University of California, San Diego School of Medicine.
While many people infected with SARS and CoV-2 are likely to show mild symptoms, others may develop severe pneumonia. While symptoms typically occur four to five days after exposure, the time between exposure and the onset of symptoms, known as the incubation period, is estimated to be three to 14 days. Colds often include a runny nose, but this is not a symptom of COVID-19, according to Dr. Schmitt.
Know that a person with COVID-19 is not contagious until they show symptoms, but recent research suggests that some people may actually be able to transmit the virus to other people within a few days of their death.
Dr Martinello said: 'Data is needed to better understand when sufferers repel the virus, what bodily fluids it contains and how it can contaminate bodily fluids and even the air surrounding them. If true, this strengthens the position that we can help reduce the risk of someone who is infected unknowingly infecting others.
People will often make basic scientific observations in research laboratories, but it takes time to figure out how clinically relevant they are. While there is much to learn, the scientists involved in the analysis observed that emerging evidence suggests that people who are infected can spread the virus without recognizing or anticipating symptoms. Scientists involved in this analysis found that SARS-CoV-2 was detectable in aerosols for up to three hours.
Sources:
https://theconversation.com/why-do-some-people-with-coronavirus-get-symptoms-while-others-dont-135546
https://www.sciencenews.org/article/coronavirus-questions-covid19-symptoms-deaths-spread
https://pandemic.internationalsos.com/2019-ncov/ncov-faqs
https://www.bbc.com/news/health-51214864
https://www.yalemedicine.org/stories/2019-novel-coronavirus/
https://www.vox.com/science-and-health/2020/3/20/21173472/coronavirus-pandemic-unknowns-questions-seasonality-reinfection-covid-19
https://www.nbcnews.com/health/health-news/what-new-coronavirus-n1119081
https://www.health.harvard.edu/diseases-and-conditions/if-youve-been-exposed-to-the-coronavirus
https://www.azcentral.com/story/news/local/arizona-health/2020/06/13/asymptomatic-spread-coronavirus-catch-covid-19/3177058001/
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