![]() ![]() ![]() They have also created drugs that lessen infection and complications. Scientists, working intensely, have invented novel vaccines in record time that provide excellent protection against the disease. But people with COVID can transmit the virus before they show clear symptoms, or they may have no symptoms at all. An individual infected with the 2002 SARS coronavirus did not transmit it until 24 to 36 hours after displaying symptoms such as fever and dry cough people feeling ill would naturally isolate themselves, or be diagnosed by doctors, before they made others sick. SARS-CoV-2 has created a far deadlier pandemic, in part because it spreads rapidly and in part because once it infects a person it can lie undetected for a long time. SARS burned out within a year MERS still lingers. Two others already triggered alarming outbreaks of disease: in 2002 a coronavirus caused severe acute respiratory syndrome, which killed more than 770 people worldwide, and in 2012 a different strain started Middle East respiratory syndrome, taking more than 800 lives. Four of them are responsible for many of our common colds. Thousands of different coronaviruses inhabit the planet. Even though mysteries remain about COVID-19 and the novel coronavirus that causes the disease, scientists have generated an incredible amount of detailed knowledge about how the virus works and how we can stop it. ![]()
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