Differences in lethality and diffusion of Covid-19 in countries using different kinds of vaccines

Carta, Mauro Giovanni;Orrù, Germano;Peracchia, Ambra;Cossu, Giulia;Velluzzi, Fernanda;Atzori, Laura;Ferreli, Caterina;Aviles Gonzalez, Ivan Cesar;Romano, Ferdinando;Littera, Roberto;Puxeddu, Roberto;Chessa, Luchino;Firinu, Davide;Del Giacco, Stefano;Restivo, Angelo;Deidda, Simona;Scano, Alessandra;Coghe, Ferdinando;Minerba, Luigi;Manconi, Maria;Saba, Luca

2022-01-01

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Abstract

To verify if lethality and diffusivity of Covid-19 correlated with percentage of people vaccinated in different countries and whether results on these indicators were comparable under different types of vaccines. A linear regression analysis was conducted between vaccines/inhabitant, new cases/inhabitants and ratio deaths/cases. A comparison between the three indicators was carried out in countries subdivided by kind of vaccine. The proportion of vaccinations/inhabitants correlates negatively with proportion of deaths x 100 cases (R = -3.90, p<0.0001), but didn't on incidence of new cases. Countries with prevalence of mRNA vaccines were similar to others on incidence of new cases; but a lower lethality of Sars-Cov2 was found than in countries with prevalence of viral vehicle vaccines (F=6.064, p= 0.0174) but didn't against countries with prevalence of inactivated vaccines. The higher is the proportion of vaccine/inhabitant in a given country, the less is the fraction of infected people who die.