Paolo Zanotto: In 2003, we had another virus of this type, that of SARS-1. I worked with him in Germany. It was an extremely problematic virus, but it did not have the ease of spreading that it did. Then we had the camel coronavirus, which goes from camels to humans, but fortunately there was no pandemic development. The current virus has an aspect that other viruses of the same type do not: an amazing transmissibility. It is a virus that has, shall we say, superpowers to transmit extremely efficiently between humans. Covid-19 is not just pneumonia. It is much more complex and devastating than pneumonia. There is a very severe lung impairment. What do we know, based on observations from the past three weeks? The person is infected and until the 4th day of symptom onset - what we call the “viral expansion phase” - the lung will accumulate lesions. The first symptoms are fever, runny nose, a very mild flu-like condition. In the period from the 2nd to the 4th day, you need to give the medicine to the person - and that medicine is hydroxychloroquine. If you don't give the medicine, on the 7th day the patient will already have a completely compromised lung. When dry cough and shortness of breath appear, it will be very difficult to treat the disease. The Prevent network found that by starting treatment from the 2nd to the 4th day, and using hydroxychloroquine in combination with azithromycin, you save the person. She won't even be hospitalized. Prevent takes care of 25% of the population of São Paulo and has thousands of patients in the city. They made a protocol, based on telemedicine: if the number of breaths per minute is over 22, they send the medication to the person's home. With this, the patient is cured at home, without even using the hospital system.