[Nosocomial epidemic outbreak of acute gastroenteritis by Norwalk-like virus]. / Estudio de un brote epidémico nosocomial de gastroenteritis aguda por virus Norwalk-like.

BACKGROUND: From the notification of an acute gastroenteritis outbreak in a nursing home, an epidemiological study was started to determine the characteristics of the outbreak and its spreading pattern and to identify determining factors. PATIENTS AND METHOD: A study of historic cohorts was performed and the case was defined by the presence of diarrhea and vomiting. Spatial aggregation in double rooms was analyzed by a binomial distribution and temporal aggregation was analyzed by a relative risks model. The variables in the study allowed us to calculate the adjusted relative risk; the odds ratio was calculated in relation to the meal on day January 30. RESULTS: We studied 95.9% residents. The total attack rate was 28.7% (31.8% employees, 30.1% permanent residents and 15.2% day residents). The attack rate in rotation health personnel was 45.2%. Spatial and temporal spread in double rooms was negative. There was a significant association with the disease in rotator employees (RR = 3.22; CI 95%, 1.30-7.99; p = 0.02). No association was found between eating and disease (OR = 1.5; CI 95%, 0.4-6.1; p = 0.46). Norwalk-like virus was isolated in four faecal samples. CONCLUSIONS: This epidemic outbreak had the characteristic of a nosocomial infection with a likely person-to-person transmission mechanism. The main factor contributing to the spread of the infection was the existence of employees in permanent contact with residents with an important physical and mental impairment, hence highly dependent on the care provided by these health workers.

[Evaluation of the impact of the heat wave in the summer of 2003 on mortality]. / Valoración del impacto de la ola de calor del verano de 2003 sobre la mortalidad.

The effect of the elevated temperatures experimented in Europe during the summer 2003 on mortality was observed in several countries. This study, carried out in Spain, describes the mortality between the 1st June and the 31st August and evaluates the effect of the heat wave on mortality. Observed deaths were obtained from official vital Registers of the capital city of the 50 provinces. Deaths from 107 randomly selected rural villages were also obtained from the same source. Observed deaths were compared with expected estimated applying a Poisson regression model to historical mortality series adjusting for the upwards trend and seasonality observed. Meteorological information was provided by the National Institute of Meteorology. Spain experienced three heat waves. Total excess deaths associated was 8% (43,212 observed compared with 40,046 expected). Excess deaths were only observed among 65 years old and over (15%). The increased mortality was also observed in rural villages. This phenomenon is becoming an emerging public health problem because of its increasing attributable risk because of the aging of Spanish population. Alert and response systems based on monitoring of climate related risks, emergency rooms activity and mortality and the strengthening of social and health services response capacity should be considered.

[The use of the capture- recapture method in evaluating the epidemiological meningococcal disease monitoring system in Tenerife, Spain (1999-2000)]. / Aplicación del método captura-recaptura en la evaluación del sistema de vigilancia epidemiológica de la enfermedad meningocócica en Tenerife (1999-2001).

BACKGROUND: Meningococcal Disease is mainly monitored passively on the Canary Islands, the regular Compulsory Disease Notification channels being used. The objective of this study includes describing the qualitative and quantitative aspects of this system and evaluating the exhaustiveness, by means of the capture-recapture system, of three information sources. METHODS: This study covers the 1999-2001 period in Tenerife. The information was gathered from three sources: the Compulsory Disease Notification System, the Microbiology Laboratories and the hospital Minimum Basic Data Set. The Evaluation Protocols of the Monitoring System of the Atlanta Centers of Disease Control and Prevention were used. A log-linear model was used for estimating the number of cases. The calculations of the exhaustiveness and the 95% confidence intervals were done in the SPSS10 statistics package. RESULTS: The system was found to have an 84.9% sensitivity, and an 80.4% positive predictive value. The delay in notification (timeliness) fell within the 0.5-13-day range, averaging 3 days. The system was found to have a 76.6% overall acceptability. The exhaustiveness value was 98.1%. CONCLUSIONS: This disease is being monitored well, with a degree of sensitivity which would be revealing of a good notification level, also confirmed by its exhaustiveness. Although the positive predictive value is high, this could be indicative of the expeditious starting of antibiotic treatment which would hinder microbiological confirmation. The system is timely, affording the possibility of measures being taken for fast intervention.

[Evaluation of a system to feedback information on Public Health: the experience of Area 2 of the Community of Madrid]. / Evaluación de un sistema de devolución de información en salud pública: experiencia en el Area 2 de la Comunidad de Madrid.

BACKGROUND: In January 2000 the Public Health Service of Area 2, in the Region of Madrid, began to publish a weekly sheet on epidemiological and public health information (HISP) addressed to health professionals working in the Area. The aim of the present study was to estimate to how extend the "HISP" was known among health professionals of Area 2, and also to estimate the suitability and usefulness of its contents, during 2000. METHODS: A postal survey was carried out among a random sample of professionals working in Area 2. A descriptive analysis of main variables was done, variables associated to the knowledge of the "HISP" were investigated. Epi Info 2000 program was used for the analysis. RESULTS: The response rate was 79.7%. The best evaluated content was that related to epidemic outbreaks. An association between knowing the "HISP" and knowing the regional epidemiological bulletin (Boletin Epidemiológico de la Comunidad de Madrid) was found (OR = 9.3, IC 95% = 2.9-29.5), and also an association between knowing the "HISP" and being a physician (OR = 4.3, IC: 1.5-12.6, p = 0.005). CONCLUSIONS: The "HISP" has a good acceptance among health professionals of Area 2. They were more interested in contents related to stressful situations. It is necessary to improve the diffusion of information on public health among nursing professionals.

[A study of whooping cough epidemic outbreak in Castellon, Spain]. / Estudio de un brote epidémico de tos ferina en Castellón.

BACKGROUND: Based on the report of several cases at one school, a study of an epidemic outbreak was started for the purpose of characterizing this outbreak from the person, place and time standpoint, calculating the effectiveness of the immunization and the concordance of the cases with the positive result of the serological study. METHODS: A "case" is defined as being that individual who has a cough fasting for two weeks. A study is made of the spread of the disease by means of the epidemic curve and the effectiveness of the pertussis vaccine. The concordance of the cases and the positive serology is evaluated by way of the Kappa index. RESULTS: From among the students at several schools and those with whom they were living at the time, a total of 130 individuals were surveyed, 94 of whom fit the "case" definition. The average age of the cases was 10.5 years of age, 42.6% being males and 84% school age children, 71.3% showing signs of recent infection (positive IgM), the average length of time since the last whooping cough immunization being 8.25 years. The effectiveness of the whooping cough booster is 66%. The concordance between the cases and the positive results of the serology reveals a Kappa = 0.45. No B. Pertussis was isolated in the 25 throat swab samples. CONCLUSIONS: Classrooms and the family environment are a factor in spreading this disease. The including of a booster at 18 months improves the effectiveness of the whooping cough immunization. The isolation of B. Pertussis is not very frequent, and the serology may be an alternative when this disease is clinically suspected.

[Economic crisis and communicable diseases. SESPAS report 2014]. / Crisis económica y patología infecciosa. Informe SESPAS 2014.

Past economic crises have increased the impact of communicable diseases especially on groups particularly vulnerable to the social and health consequences of the recession. However, it has been shown that the impact of these crises largely depends on the response of governments and the inhabitants of affected countries. We describe the consequences of the current crisis in the causal chain of infectious disease, including the response of the health system, and explore whether there is evidence of its impact in Spain. It is assumed that the possible effect of the crisis on living and working conditions is due to individual and social debt coupled with high unemployment as defining features of the crisis. We highlight the potential negative consequences of healthcare cuts on vulnerable populations, which have been partly excluded with the recent reform of health coverage. We compare mortality and morbidity data between two periods: before and after 2008, integrating, where possible, observed trends and institutional reports. Overall, no effect on infectious disease has been detected so far, although some signs of worsening, which could be compatible with the effects of the crisis, have been observed and need to be monitored and confirmed. We review the limitations of data sources that may not be sufficiently sensitive or up-to-date to detect changes that may require a latency period to become manifest. Instead of cutting resources, surveillance of these diseases should be improved, and an equitable social health response, which targets the population most affected by the crisis, should be guaranteed.

[Salmonella enteritis in Huesca. 1996-1999]. / Enteritis por Salmonella en Huesca. 1996-1999.

BACKGROUND: The enteritis due to Salmonella is still an important cause of infectious gastroenteritis, that is responsible of 85% of the foodborne outbreaks in Spain. It represents without any doubt a public health problem that involves several health care services and preventive services. SUBJECTS AND METHOD: Using two sources of information: the National Diseases Surveillance System and the Microbiology Laboratories of the Hospitals (MLH) we estimated the incidence of Salmonella infection by the capture-recapture method. Besides, a descriptive study of the disease is done and the more frequent serogroups in the province of Huesca during the period 1996-1999. RESULTS: The total number of cases was 959, which means a media annual rate of 116.6 3 105. The estimated number of cases was 1,145 (media annual rate 5 139.5 3 105). The completeness is higher for the MLH (68%, CI 95%: 66-71). The group D is the more frequent (53.4%) and of this, specially the Salmonella enteritidis. 31% of the cases are under 5 years, and 38.2% are admitted to the hospital. The cases appear seasonally from May to September, with an important peak during the month of August. CONCLUSIONS: The improve in the notification and identification of cases by the reporting sources and by the Laboratory Services allowed us to better know the disease. Our results and the proportion of groups-serotypes are similar to the results of other studies.