Dear colleagues,

Many first line clinicians have found the Covid-19 caused by the SARS-CoV2 virus does not create ARDS (Acute Respiratory Distress Syndrome), but a hypoxemic disorder of vascular origin, a lack of oxygen in the blood by thromboembolism, in other words "clots" in the vessels. Indeed, for prof. Dr. Sandro Giannini from Bologna University "the death cause for many positive Covid patients would be due to a generalized venous micro-thromboembolism, ending in pulmonary colaps." If this were the case, we would have to understand some intubations beeing of poor help, since thromboembolism must first be dissolved or prevented. Indeed, there is no point in ventilating a lung if blood is not reaching that lung. Nine out of ten ventilated people die, according to Prof. Giannini, because the problem is cardiovascular and not pulmonary. Why blood clots form in patients with Covic-19 remains to be understood !!! "It is as if the patients were suddenly in a plane at an altitude of 9000 meters and the cabin pressurization gradually decreased," notes Dr. Cameron Kyle-Sidell, emergency doctor, in charge of a Covid-19 center in New -York. Patients are slowly deprived of oxygen. " So, how can taht happen ?

2) Excluding S. Aureus opportunistic infections, we must admit the CoV2 virus is causing that generalized micro-thromboembolism. Does this has something to do with the immunitary defense response? Or more with the virus infectious mecanistic itself ?

3) The pulmonary syncytia observed in CoV2 infected lung, rosed wider questioning as for the CoV2 virus-induced cell fusion potential in other tissues than lungs. Does viral production and distribution of virus-induced erythrocyte binding sites correlates with progress of fusion ? Does hemadsorption occurres with CoV2 ? An if it does so, would it be predominant within the confines of the syncytia ? We know in measles infections, the erythrocytes are scattered sparsely over immature syncytia, while densely packed in the center of mature syncytia ( Rentier B et al 1978). Interestingly hemadsorption was completely inhibited in measles virus-infected cultures pretreated with virus-specific immunoglobulin G. Would that happen with CoV2 ? There is so much to know about !

Best, DCM

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