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dc.contributor.authorPachetti, Maria
dc.contributor.authorMarini, Bruna
dc.contributor.authorGiudici, Fabiola
dc.contributor.authorBenedetti, Francesca
dc.contributor.authorAngeletti, Silvia
dc.contributor.authorCiccozzi, Massimo
dc.contributor.authorMasciovecchio, Claudio
dc.contributor.authorIppodrino, Rudy
dc.contributor.authorZella, Davide
dc.date.accessioned2020-09-11T15:53:49Z
dc.date.available2020-09-11T15:53:49Z
dc.date.issued2020-09-02
dc.identifier.urihttp://hdl.handle.net/10713/13684
dc.description.abstractBACKGROUND: Severe acute respiratory syndrome CoV-2 (SARS-CoV-2) caused the first coronavirus disease 2019 (COVID-19) outbreak in China and has become a public health emergency of international concern. SARS-CoV-2 outbreak has been declared a pandemic by WHO on March 11th, 2020 and the same month several Countries put in place different lockdown restrictions and testing strategies in order to contain the spread of the virus. METHODS: The calculation of the Case Fatality Rate of SARS-CoV-2 in the Countries selected was made by using the data available at https://github.com/owid/covi-19-data/tree/master/public/data . Case fatality rate was calculated as the ratio between the death cases due to COVID-19, over the total number of SARS-CoV-2 reported cases 14 days before. Standard Case Fatality Rate values were normalized by the Country-specific ρ factor, i.e. the number of PCR tests/1 million inhabitants over the number of reported cases/1 million inhabitants. Case-fatality rates between Countries were compared using proportion test. Post-hoc analysis in the case of more than two groups was performed using pairwise comparison of proportions and p value was adjusted using Holm method. We also analyzed 487 genomic sequences from the GISAID database derived from patients infected by SARS-CoV-2 from January 2020 to April 2020 in Italy, Spain, Germany, France, Sweden, UK and USA. SARS-CoV-2 reference genome was obtained from the GenBank database (NC_045512.2). Genomes alignment was performed using Muscle and Jalview software. We, then, calculated the Case Fatality Rate of SARS-CoV-2 in the Countries selected. RESULTS: In this study we analyse how different lockdown strategies and PCR testing capability adopted by Italy, France, Germany, Spain, Sweden, UK and USA have influenced the Case Fatality Rate and the viral mutations spread. We calculated case fatality rates by dividing the death number of a specific day by the number of patients with confirmed COVID-19 infection observed 14 days before and normalized by a ρ factor which takes into account the diagnostic PCR testing capability of each Country and the number of positive cases detected. We notice the stabilization of a clear pattern of mutations at sites nt241, nt3037, nt14408 and nt23403. A novel nonsynonymous SARS-CoV-2 mutation in the spike protein (nt24368) has been found in genomes sequenced in Sweden, which enacted a soft lockdown strategy. CONCLUSIONS: Strict lockdown strategies together with a wide diagnostic PCR testing of the population were correlated with a relevant decline of the case fatality rate in different Countries. The emergence of specific patterns of mutations concomitant with the decline in case fatality rate needs further confirmation and their biological significance remains unclear.en_US
dc.description.urihttps://doi.org/10.1186/s12967-020-02501-xen_US
dc.language.isoenen_US
dc.publisherSpringer Natureen_US
dc.relation.ispartofJournal of Translational Medicineen_US
dc.subjectCOVID-19en_US
dc.subjectCase fatality rateen_US
dc.subjectEuropeen_US
dc.subjectLockdown strategyen_US
dc.subjectMutationen_US
dc.subjectSARS-CoV-2en_US
dc.subjectTesting capacityen_US
dc.subjectUnited Statesen_US
dc.titleImpact of lockdown on Covid-19 case fatality rate and viral mutations spread in 7 countries in Europe and North Americaen_US
dc.typeArticleen_US
dc.identifier.doi10.1186/s12967-020-02501-x
dc.identifier.pmid32878627
dc.source.volume18
dc.source.issue1
dc.source.beginpage338
dc.source.endpage
dc.source.countryEngland


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