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Article ; Online: Exact Quench Dynamics of the Floquet Quantum East Model at the Deterministic Point.

Bertini, Bruno / De Fazio, Cecilia / Garrahan, Juan P / Klobas, Katja

2024 Volume 132, Issue 12, Page(s) 120402

Abstract: We study the nonequilibrium dynamics of the Floquet quantum East model (a Trotterized version of the kinetically constrained quantum East spin chain) at its "deterministic point," where evolution is defined in terms of CNOT permutation gates. We solve ... ...

Abstract	We study the nonequilibrium dynamics of the Floquet quantum East model (a Trotterized version of the kinetically constrained quantum East spin chain) at its "deterministic point," where evolution is defined in terms of CNOT permutation gates. We solve exactly the thermalization dynamics for a broad class of initial product states by means of "space evolution." We prove: (i) the entanglement of a block of spins grows at most at one-half the maximal speed allowed by locality (i.e., half the speed of dual-unitary circuits); (ii) if the block of spins is initially prepared in a classical configuration, speed of entanglement is a quarter of the maximum; (iii) thermalization to the infinite temperature state is reached exactly in a time that scales with the size of the block.
Language	English
Publishing date	2024-04-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.132.120402
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Book ; Online: Exact "hydrophobicity" in deterministic circuits

Klobas, Katja / De Fazio, Cecilia / Garrahan, Juan P.

dynamical fluctuations in the Floquet-East model

2023

Abstract: We study the dynamics of a classical circuit corresponding to a discrete-time deterministic kinetically constrained East model. We show that -- despite being deterministic -- this "Floquet-East" model displays pre-transition behaviour, which is a ... ...

Abstract	We study the dynamics of a classical circuit corresponding to a discrete-time deterministic kinetically constrained East model. We show that -- despite being deterministic -- this "Floquet-East" model displays pre-transition behaviour, which is a dynamical equivalent of the hydrophobic effect in water. By means of exact calculations we prove: (i) a change in scaling with size in the probability of inactive space-time regions (akin to the "energy-entropy" crossover of the solvation free energy in water), (ii) a first-order phase transition in the dynamical large deviations, (iii) the existence of the optimal geometry for local phase separation to accommodate space-time solutes, and (iv) a dynamical analog of "hydrophobic collapse". We discuss implications of these exact results for circuit dynamics more generally. Comment: 15 pages, 5 figures
Keywords	Condensed Matter - Statistical Mechanics ; Nonlinear Sciences - Cellular Automata and Lattice Gases
Subject code	612
Publishing date	2023-05-12
Publishing country	us
Document type	Book ; Online
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Article: Antimicrobial susceptibility profiles and genotyping of

Vacca, Paola / Fazio, Cecilia / Neri, Arianna / Ambrosio, Luigina / Carannante, Anna / Lista, Florigio / Fillo, Silvia / Ciammaruconi, Andrea / Fortunato, Antonella / Stefanelli, Paola

Frontiers in microbiology

2024 Volume 14, Page(s) 1272123

Abstract: Background: In Italy the introduction of meningococcal C conjugate vaccine in 2005 has led to a significant reduction of invasive meningococcal disease (IMD) caused by : Methods: Bacterial isolates and biological samples (blood or cerebrospinal fluid) ...

Abstract	Background: In Italy the introduction of meningococcal C conjugate vaccine in 2005 has led to a significant reduction of invasive meningococcal disease (IMD) caused by Methods: Bacterial isolates and biological samples (blood or cerebrospinal fluid) from invasive meningococcal cases are collected and characterized at the National Reference Laboratory for IMD of Istituto Superiore di Sanità. Antimicrobial susceptibility was determined by MIC Test Strip Method and interpreted according to the EUCAST breakpoints guideline. Genotypic characteristics, including multi locus sequence typing (MLST), finetype, and antimicrobial resistance target genes were performed and analyzed using the PubMLST database. Genomic comparison of core genome MLST (cgMLST) of MenC genomes was also carried out. Results: From 2000 to 2020, a total of 665 MenC isolates were investigated for antimicrobial susceptibility and 301 for genotyping. Over two decades, almost all MenC isolates resulted susceptible to antimicrobials with few isolates resulting resistant to ciprofloxacin ( Conclusion: Wider application of the genomic analysis and monitoring of antimicrobial susceptibility represent key aspects of IMD surveillance and to monitor the continued evolution of these hyperinvasive strains.
Language	English
Publishing date	2024-01-03
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2587354-4
ISSN	1664-302X
ISSN	1664-302X
DOI	10.3389/fmicb.2023.1272123
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Article ; Online: FHbp variants among meningococci of serogroup B in Italy: Evolution and selective pressure, 2014-2017.

Lo Presti, Alessandra / Carannante, Anna / Fazio, Cecilia / Neri, Arianna / Vacca, Paola / Ambrosio, Luigina / Lista, Florigio / Fillo, Silvia / Stefanelli, Paola

PloS one

2023 Volume 18, Issue 2, Page(s) e0277976

Abstract: Background: Neisseria meningitidis (meningococcus) is the causative agent of invasive meningococcal disease (IMD). Meningococcus of serogroup B (MenB) is one of the main serogroup causing IMD. MenB strains may be prevented by meningococcal B vaccines. ... ...

Abstract	Background: Neisseria meningitidis (meningococcus) is the causative agent of invasive meningococcal disease (IMD). Meningococcus of serogroup B (MenB) is one of the main serogroup causing IMD. MenB strains may be prevented by meningococcal B vaccines. In particular, vaccines with Factor H-binding protein (FHbp), classified into two subfamilies (A or B) or in three variants (v1, v2 or v3), are those available. The objective of the study was to investigate the phylogenetic relationships of FHbp subfamilies A and B (variants v1, v2 or v3) genes and proteins, together with their evolution patterns and selective pressure. Materials and methods: Overall, alignments of FHbp nucleotide and protein sequence from 155 MenB samples collected in different parts of Italy, from 2014 to 2017, were analyzed by ClustalW. JModeltest and the Smart Model Selection software were used for the statistical selection of the best-fit substitution models for nucleotide and protein alignments. Site-specific positive and negative selection were estimated through the HYPHY package. The phylogenetic signal was investigated with the likelihood mapping method. The Maximum Likelihood (ML) phylogenetic reconstructions were performed with Phyml. Results: The phylogenic analysis identified different clusters within the FHbp subfamily A and B variants, confirming sequence diversity. The pattern of selective pressure in our study indicated that subfamily B FHbp sequences are subjected to greater variations and positive selective pressure respect to subfamily A, with 16 positively supported selected sites identified. Conclusion: The study pointed out the need for continued genomic surveillance for meningococci to monitor selective pressure and amino acidic changes. Monitoring the genetic diversity and molecular evolution of FHbp variants may be useful to investigate genetic diversity which may emerge over time.
MeSH term(s)	Humans ; Neisseria meningitidis/genetics ; Bacterial Proteins/genetics ; Antigens, Bacterial/genetics ; Carrier Proteins/genetics ; Complement Factor H/genetics ; Serogroup ; Phylogeny ; Neisseria meningitidis, Serogroup B/genetics ; Meningococcal Infections/epidemiology ; Meningococcal Infections/genetics ; Meningococcal Vaccines ; Italy
Chemical Substances	Bacterial Proteins ; Antigens, Bacterial ; Carrier Proteins ; Complement Factor H (80295-65-4) ; Meningococcal Vaccines
Language	English
Publishing date	2023-02-16
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2267670-3
ISSN	1932-6203 ; 1932-6203
ISSN (online)	1932-6203
ISSN	1932-6203
DOI	10.1371/journal.pone.0277976
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Article ; Online: Evaluating the effect of targeted strategies as control tools for hypervirulent meningococcal C outbreaks: a case study from Tuscany, Italy, 2015 to 2016.

Guzzetta, Giorgio / Ajelli, Marco / Miglietta, Alessandro / Fazio, Cecilia / Neri, Arianna / Merler, Stefano / Rezza, Giovanni / Stefanelli, Paola

Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin

2023 Volume 28, Issue 19

Abstract: BackgroundMeningococcus ( ...

Abstract	BackgroundMeningococcus (
MeSH term(s)	Humans ; Disease Outbreaks/prevention & control ; Italy/epidemiology ; Meningococcal Infections/epidemiology ; Meningococcal Infections/prevention & control ; Meningococcal Infections/microbiology ; Meningococcal Vaccines ; Neisseria meningitidis ; Neisseria meningitidis, Serogroup C
Chemical Substances	Meningococcal Vaccines
Language	English
Publishing date	2023-05-11
Publishing country	Sweden
Document type	Evaluation Study ; Journal Article
ZDB-ID	1338803-4
ISSN	1560-7917 ; 1025-496X
ISSN (online)	1560-7917
ISSN	1025-496X
DOI	10.2807/1560-7917.ES.2023.28.19.2200650
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Article ; Online: Did social distancing measures deployed for SARS-CoV-2/COVID-19 control have an impact on invasive meningococcal disease?

Stefanelli, Paola / Fazio, Cecilia / Vacca, Paola / Neri, Arianna / Ambrosio, Luigina / Rezza, Giovanni

Pathogens and global health

2021 Volume 116, Issue 4, Page(s) 263–265

Abstract: We investigated the impact of social distancing measures, used to contain or mitigate SARS-CoV-2 spread, on the transmission of invasive meningococcal disease (IMD) in Italy. To this end, the temporal correlation between the implementation of lockdown ... ...

Abstract	We investigated the impact of social distancing measures, used to contain or mitigate SARS-CoV-2 spread, on the transmission of invasive meningococcal disease (IMD) in Italy. To this end, the temporal correlation between the implementation of lockdown measures in 2020 and IMD incidence was evaluated. A dramatic decline of IMD incidence was observed, suggesting that the measures applied to contain SARS-CoV-2 in Italy affected other infectious diseases transmitted through direct contact and droplets, at least in the early phase of the COVID-19 pandemic.
MeSH term(s)	COVID-19 ; Communicable Disease Control ; Humans ; Meningococcal Infections/epidemiology ; Meningococcal Infections/prevention & control ; Pandemics/prevention & control ; Physical Distancing ; SARS-CoV-2
Language	English
Publishing date	2021-11-30
Publishing country	England
Document type	Journal Article
ZDB-ID	2625162-0
ISSN	2047-7732 ; 2047-7724
ISSN (online)	2047-7732
ISSN	2047-7724
DOI	10.1080/20477724.2021.1995657
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Article: Estimates of the reproductive numbers and demographic reconstruction of outbreak associated with C:P1.5–1,10–8:F3–6:ST–11(cc11) Neisseria meningitidis strains

Lo Presti, Alessandra / Vacca, Paola / Neri, Arianna / Fazio, Cecilia / Ambrosio, Luigina / Rezza, Giovanni / Stefanelli, Paola

Infection, genetics, and evolution. 2020 Oct., v. 84

2020

Abstract: Neisseria meningitidis can cause sporadic cases and outbreaks of invasive disease, including meningitis and sepsis. The meningococcal serogroup C (MenC) is the second most common serogroup in Italy after MenB. In this study we have estimated the ... ...

Abstract	Neisseria meningitidis can cause sporadic cases and outbreaks of invasive disease, including meningitis and sepsis. The meningococcal serogroup C (MenC) is the second most common serogroup in Italy after MenB. In this study we have estimated the reproductive numbers and the demographic reconstruction on the genomes of invasive N. meningitidis C:P1.5–1,10–8:F3–6:ST–11(cc11) strains isolated in Italy in 2012 – 2017, a period that includes the outbreak in Tuscany.The genomes of N. meningitidis were sequenced using the Illumina MiSeq platform, through the whole genome sequencing (WGS) method and were analyzed by the core genome MLST (cgMLST) approach, using the BIGSdb Genome Comparator tool implemented on the PubMLST website. A Bayesian method was applied to study population dynamics across the entire N. meningitidis dataset. The basic reproduction number R₀, which indicates the average number of secondary cases generated by a single primary case, was calculated using a Bayesian method, on the dataset and on the two subsets. The effective reproduction number R(t), defined as the average number of secondary cases per infectious case in a population, made up of susceptible and non-susceptible hosts was studied on the Tuscany dataset, with a Bayesian method.An increase in the effective number of the N. meningitidis infections was observed between 2013 and 2016. The estimated R₀ parameter was 1.31 (95% HPD: 1.03 – 1.64), 1.22 (95% HPD: 0.90 – 1.64) and 1.4 (95% HPD: 0.91 – 1.9) for the entire dataset, first and second subset, respectively. The BDSKY estimated an initial R(t) of about 2.0 (95% HPD: 0.04 – 5.0), which showed a growing trend at the end of 2014, reaching an average value of 3.22 in 2015, and then declining below 1 from the year 2016.Monitoring the effective reproduction number can help to inform future vaccination strategies. The increase in the reproductive number for the Tuscany dataset, was consistent with the amplification event that led to the Tuscany outbreak. Subsequently, the intervention that led to the decline of the cases was followed, suggesting a high effectiveness of the vaccination campaign.
Keywords	Bayesian theory ; Internet ; Neisseria meningitidis ; basic reproduction number ; data collection ; evolution ; genome ; meningitis ; population dynamics ; reproduction ; serotypes ; vaccination ; Italy
Language	English
Dates of publication	2020-10
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2037068-4
ISSN	1567-1348
ISSN	1567-1348
DOI	10.1016/j.meegid.2020.104360
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Evaluation of the national surveillance system for invasive meningococcal disease, Italy, 2015-2018.

Andrianou, Xanthi D / Riccardo, Flavia / Caporali, Maria Grazia / Fazio, Cecilia / Neri, Arianna / Vacca, Paola / Ambrosio, Luigina / Pezzotti, Patrizio / Stefanelli, Paola

PloS one

2021 Volume 16, Issue 1, Page(s) e0244889

Abstract: Enhanced laboratory-based surveillance of invasive meningococcal disease (IMD) in Italy was only assessed indirectly by numerically comparing surveillance data cases with hospital discharge records (HDR). In this study, we evaluated the completeness, ... ...

Abstract	Enhanced laboratory-based surveillance of invasive meningococcal disease (IMD) in Italy was only assessed indirectly by numerically comparing surveillance data cases with hospital discharge records (HDR). In this study, we evaluated the completeness, timeliness and sensitivity of the IMD surveillance in Italy from 2015 to 2018. Completeness and timeliness were described at the national and subnational level. A capture-recapture analysis was conducted to evaluate the sensitivity and positive predictive value (PPV) using HDR as the external source with a combination of deterministic and probabilistic approaches. The characteristics of the unmatched vs. matched cases were compared using multivariable Poisson modeling. Overall, the completeness of data improved, except for specific variables. Timeliness of notifications also improved to a median of 4 days from onset to reporting. For the years 2015-2017, the sensitivity of the surveillance was estimated at 71.4% and the PPV at 77.5%, changing to 80.6% and 66.9% respectively after removing cases with a secondary meningitis diagnosis. We noted substantial sub-national differences. In 2018 sensitivity was 66.5% (135/203) and the PPV was 79.4% (135/170). The adjusted relative risk of being unmatched in 2015-2017 was higher in cases that were ≥60 years, had missing information or symptom onset in December. The IMD surveillance system overall performs well with completeness and timeliness improving in time. Specific challenges identified for individual variables should guide further improvement. Notwithstanding limitations posed by the comparison database, sensitivity and PPV are promising. The study highlights that promoting etiological ascertainment in people ≥60 years and addressing sub-national challenges are the main current challenges to address.
MeSH term(s)	Adult ; Epidemiological Monitoring ; Female ; Humans ; Italy/epidemiology ; Male ; Meningococcal Infections/epidemiology ; Severity of Illness Index
Language	English
Publishing date	2021-01-08
Publishing country	United States
Document type	Journal Article
ISSN	1932-6203
ISSN (online)	1932-6203
DOI	10.1371/journal.pone.0244889
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Article: Evaluation of Meningococcal Serogroup C Bactericidal Antibodies after Primary Vaccination: A Multicentre Study, Italy.

Neri, Arianna / Fabiani, Massimo / Barbui, Anna Maria / Vocale, Caterina / Miglietta, Alessandro / Fazio, Cecilia / Carannante, Anna / Palmieri, Annapina / Vacca, Paola / Ambrosio, Luigina / Stefanelli, Paola

Vaccines

2022 Volume 10, Issue 5

Abstract: Here, we evaluated over time in different cohorts of children vaccinated against serogroup C Neisseria meningitidis, the presence of antibodies with neutralizing activity. A total of 348 sera samples of enrolled children by year since vaccination (<1 ... ...

Abstract	Here, we evaluated over time in different cohorts of children vaccinated against serogroup C Neisseria meningitidis, the presence of antibodies with neutralizing activity. A total of 348 sera samples of enrolled children by year since vaccination (<1 year- up to 5 years), starting from February 2016 to December 2017, were collected in three collaborating centers. Meningococcal serogroup C (MenC) antibody titers were measured with a serum bactericidal antibody (SBA) assay using rabbit complement (rSBA) following standard operating procedures. The cut-off of rSBA titer ≥ 8 is considered the correlate of protection. We observed a significantly declining of bactericidal rSBA titers by 23% every year, for every 1-year from vaccination (Adjusted PR = 0.77, 95% CI: 0.71−0.84). The proportions of children with bactericidal antibodies, immunized with the meningococcal serogroup C conjugate (MCC) vaccine, declined from 67.7% (95% CI: 48.6−83.3%) one year after vaccination, to 36.7% (95% CI: 19.9−56.1%) five years after vaccination (chi-square for linear trend, p < 0.001). Children vaccinated with the tetravalent meningococcal serogroup ACWY vaccine resulted in a high proportion of bactericidal rSBA MenC titer ≥ 1:8 (90.6%, 95% CI: 79.3−96.9%) after a mean time of seven months. Overall, the results provide some evidences on the evaluation of meningococcal serogroup C bactericidal antibodies after primary vaccination.
Language	English
Publishing date	2022-05-14
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2703319-3
ISSN	2076-393X
ISSN	2076-393X
DOI	10.3390/vaccines10050778
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Article ; Online: Primary septic arthritis of the knee caused by Neisseria meningitidis serogroup B in an elderly patient. Case report and review of the literature.

Longo, Benedetta / Fazio, Cecilia / Meini, Simone / Neri, Arianna / Andreoli, Elisabetta / Vacca, Paola / Salamone, Domenico / Sani, Spartaco / Mura, Maddalena / Bracalente, Irene / Venturini, Luigi / Andreini, Roberto / Ambrosio, Luigina / Carannante, Anna / Stefanelli, Paola

Infection

2022 Volume 51, Issue 2, Page(s) 499–506

Abstract: Purpose: Primary meningococcal arthritis (PMA) represents an uncommon clinical presentation of meningococcal infection, mainly reported among young people. Herein, a case of PMA of the knee in an elderly patient is described.: Case presentation: On ... ...

Abstract	Purpose: Primary meningococcal arthritis (PMA) represents an uncommon clinical presentation of meningococcal infection, mainly reported among young people. Herein, a case of PMA of the knee in an elderly patient is described. Case presentation: On January 2022, an 87-year-old patient arrived at hospital with continuous fever persisting for three days and a picture of pain, swelling, redness, and warmth of her left knee. An arthrocentesis was promptly performed and the inoculated synovial fluid turned positive with numerous Gram-negative diplococci at the microscopic examination. The identification of bacteria was done in 48 h using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF) MS systems (VITEK Review of the literature: A total of 41 cases of PMA caused by N. meningitidis was reported in the literature, but only four occurred in elderly. To our knowledgements, no cases of PMA caused by MenB were previously reported among patients of more than 65 years of age.
MeSH term(s)	Humans ; Female ; Aged ; Adolescent ; Aged, 80 and over ; Serogroup ; Neisseria meningitidis ; Meningococcal Infections/diagnosis ; Meningococcal Infections/drug therapy ; Meningococcal Infections/microbiology ; Knee Joint ; Arthritis, Infectious/diagnosis ; Arthritis, Infectious/drug therapy ; Arthritis, Infectious/microbiology
Language	English
Publishing date	2022-10-01
Publishing country	Germany
Document type	Review ; Case Reports ; Journal Article
ZDB-ID	185104-4
ISSN	1439-0973 ; 0300-8126 ; 0173-2129
ISSN (online)	1439-0973
ISSN	0300-8126 ; 0173-2129
DOI	10.1007/s15010-022-01928-2
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