Effectiveness of the BNT162b2 mRNA Covid-19 vaccine in Spanish healthcare workers.

Introduction: Frontline health care workers (HCW) have higher risk than the general population to become infected by SARS.CoV.2, so they were a priority group for Covid-19 vaccine administration.

First wave of the COVID-19 pandemic in Madrid: handling the unexpected in a tertiary hospital.

Introduction: The COVID-19 pandemic was declared on March 11, 2020. By the end of January, the first imported cases were detected in Spain and, by March, the number of cases was growing exponentially, causing the implementation of a national lockdown. Madrid has been one of the most affected regions in terms of both cases and deaths.

Clinical characteristics and outcome of hospitalized elderly patients with COVID- 19 after vaccine failure.

We described clinical characteristics and outcome of 160 patients over 65 years (01 September to 31 August 2021) who had a first positive SARS-CoV-2 PCR- test more than 14 days after full vaccination and were hospitalized with COVID-19. Median age of included patients was 84 years, 61.2% were over 80 years; 50.

Dissemination of a single ST11 clone of OXA-48-producing within a large polyclonal hospital outbreak determined by genomic sequencing.

The population structure of a set of OXA-48-producing isolates belonging to sequence type 11 (ST11 Kp-OXA) and obtained from two hospitals in Madrid in the period from 2012 to 2015 was studied by genome sequencing. Overall, 97 ST11 Kp-OXA isolates were sequenced and their population structure and demography were studied by Bayesian phylodynamic analysis using core-genome SNVs. In total, 92 isolates were from Hospital La Paz, 57 of them from two selected units.