[Factors associated to death in patients hospitalized due to COVID-19].

Background: SARS-CoV-2 virus was notified by the World Health Organization in January 2020 as a global emergency, due to its intense transmission, and clinical picture, that is aggravated in susceptible people.

Objective: To describe the factors associated with death in COVID-19 and pneumonia patients hospitalized in a thirdlevel center.

Material And Methods: An undivided case-control study was carried out.

[Method to calculate the additional hospital stay in patients with cross infection].

Objective: To calculate additional hospital stay due to specific cross infection.

Methods: Cases and controls study; matched by age +/- 2 years, sex, specialty in which were taken care, diagnosis, surgical procedure and hospitalization stay, between July 2005-June 2006.

Analysis: t test, chi(2) to calculate death risk, Kaplan-Meier analysis to calculate survival, Hosmer-Lemeshow test to know the contribution of cross infection for additional hospital stay due to cross infection (AHSDCI).

[Nosocomial infections in a high specialty hospital. Factors associated to mortality in the infected patient].

Introduction: Nosocomial infections (NIs) are a quality indicator of health care centers. However, a decrement of NIs occurrence can be the cause of an effective prevention program or it could be the result of a poor NI case research. The patient's characteristics and the complexity of his/her ailment are related to a higher risk of mortality.