@ARTICLE{10.21494/ISTE.OP.2022.0835, 

TITLE={Covid19 and Process Engineering}, 
  
AUTHOR={Nicolas Reversat, Jean Claude André, }, 
	
JOURNAL={Entropy: Thermodynamics – Energy – Environment – Economy }, 
	
VOLUME={3}, 

NUMBER={Issue 1}, 
	
YEAR={2022}, 

URL={http://www.openscience.fr/Covid19-and-Process-Engineering}, 
	
DOI={10.21494/ISTE.OP.2022.0835}, 
	
ISSN={2634-1476}, 
	
ABSTRACT={For about two years, we have been suffering from the effect of the SARS-COV-2 pandemic [Covid-19]. Distraught, politicians in their speeches have gone from the theme of an ordinary flu, without major effects, to more credible prevention obligations, sometimes with delay. France counts today more than 130,000 deaths! All the society (including scientists), in the ambient vagueness, added its vision and its own proposals, which did not arrange anything. By using (for the most part) methods of solving classical differential equations, we find most of the couplings between viruses (growth, exposure, disappearance) and individuals (sick, immunized, etc.), already scientifically validated. Trends resulting from this semi-quantitative modeling validate a number of effects: social distancing, barrier gestures, mask efficiency, interest in teleworking, etc. On the other hand, in spite of the political rhetoric, validated by its scientific council, it is possible that vaccination will not serve to reduce the pandemic if the vaccinated (protected from the most serious effects) re-emit the virus, even in small quantities. Similarly, the existence of a collective immunity is not proven...}}