Delta is a novel coronavirus mutant strain, which is more transmissible, has a higher viral load and is more pathogenic than other types. The initial clinical manifestations of delta virus infection are atypical, with fever, dry cough and malaise as the main clinical manifestations, and some patients may have no obvious discomfort. A few patients may have non-specific symptoms such as cough, sore throat, nasal congestion, runny nose, olfactory disturbance, muscle aches and pains, and diarrhea in the early stage. The incubation period of this virus is relatively short, and as the disease progresses, patients are prone to become heavy or critical cases. Severely ill patients may have respiratory distress, varying degrees of hypoxemia, rapid progression to acute respiratory distress syndrome, septic shock, uncorrectable metabolic acidosis and coagulation dysfunction, and even multi-organ failure (e.g., liver failure, renal failure). Very few patients may also have central nervous system involvement and other manifestations, which are more damaging to the organism. However, it should be noted that the spread of the delta strain does not mean that the vaccine is ineffective. Vaccination can effectively reduce hospitalization, severe illness and mortality, and active vaccination is recommended. Protection in daily life should also be done by insisting on wearing a mask, washing hands regularly and keeping a safe social distance, which can reduce the chances of virus transmission.
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