Novel coronavirus; COVID-19 (novel coronavirus)
There may be no obvious clinical symptoms. Different clinical types have different manifestations.
Mild patients show symptoms such as low fever, mild fatigue, smell and taste disorders; Severe patients often have symptoms such as dyspnea and/or hypoxemia one week after onset.
What are the early symptoms of novel coronavirus?
COVID-19 generally has no obvious symptoms. In the early stage of COVID-19's post-infection disease, some patients may have no obvious symptoms. Most other patients mainly show fever, dry cough and fatigue. But in addition, due to individual differences, patients may also have symptoms such as muscle pain, chest tightness, itchy throat, sore throat, stuffy nose, runny nose, diarrhea and abnormal taste. These symptoms lack specificity and can be seen in many diseases, which are not unique to COVID-19. Therefore, it is difficult for patients to identify whether they are infected with COVID-19 by the symptoms themselves. When the above-mentioned symptoms appear and you think that you have had contact with COVID-19 and infected people in the past, you should go to the fever clinic of designated medical institutions as soon as possible to make a clear diagnosis.
What are the typical symptoms in novel coronavirus?
Patients with COVID-19's disease are characterized by fever, dry cough and fatigue. Some patients have symptoms such as nasal congestion, runny nose, sore throat, loss or loss of smell and taste, conjunctivitis, muscle pain and diarrhea.
COVID-19 patients infected with Omicron vaccine have no obvious clinical symptoms and mild symptoms. The clinical symptoms of COVID-19's patients are mainly mild to moderate fever, dry throat, sore throat, stuffy nose, runny nose and other symptoms of upper respiratory tract infection.
Mild patients may have low fever, mild fatigue, smell and taste disorders. No pneumonia.
Severe patients often have dyspnea and/or hypoxemia one week after onset, and severe patients can rapidly progress to acute respiratory distress syndrome, septic shock, metabolic acidosis that is difficult to correct, bleeding and coagulation dysfunction and multiple organ failure.
Very few patients can also have manifestations such as central nervous system involvement and ischemic necrosis of limbs.
It is worth noting that severe and critically ill patients may have moderate to low fever or even no obvious fever during the course of the disease.
In addition to the above symptoms, there may be a variety of system manifestations:
Changes in smell and taste
The first symptom of some patients is the loss of smell or taste. The World Health Organization (WHO) lists the loss of sense of smell or taste as a new symptom of novel coronavirus infection. Olfactory loss is a potential screening symptom, which helps to find suspected cases or guide isolation and protection. Therefore, it is suggested that patients with sudden anosmia should be regarded as potential infected persons in novel coronavirus.
Symptoms of digestive system
People infected with novel coronavirus can show a variety of symptoms of digestive system, even as the first symptom, which requires medical workers to attach great importance to, identify as early as possible, and carry out corresponding protection and disinfection. COVID-19's digestive system symptoms can be manifested as loss of appetite, nausea, vomiting, diarrhea, abdominal pain, abnormal liver enzymes and so on. In severe cases, gastrointestinal bleeding may occur. Among them, diarrhea is the most common, and the frequency, duration and severity of diarrhea.