Efectos del decúbito prono en síndrome de distrés respiratorio agudo secundario a COVID-19: experiencia en un hospital de alta complejidad Effects of prone position in acute respiratory distress syndrome secondary to COVID-19: experience in a high complexity hospital

Introducción Para el manejo del síndrome de distrés respiratorio agudo (SDRA) moderado a severo por COVID-19 se recomendó el uso de ventilación mecánica protectora y decúbito prono debido a la gran utilidad reportada sobre la oxigenación y mortalidad. Nuestro objetivo es describir el comportamiento gasométrico y mecánico en sujetos con SDRA por COVID-19 manejados con ventilación mecánica protectora y decúbito prono en un hospital de alta complejidad. Método Estudio observacional. Se incluyeron sujetos ≥ 18 años con SDRA por COVID-19. Se inició ventilación mecánica protectora desde la primera conexión a ventilación invasiva, mientras que el decúbito prono inició con PaO2/FIO2 150. Se realizó un seguimiento durante y posterior al decúbito prono. Se realizó un análisis descriptivo de las características basales y comparación de medias entre grupos mediante prueba de Dunn y Friedman. La significación estadística se estableció en p 0,05 a dos colas en todos los análisis. Resultados Se estudiaron 74 sujetos, 58% corresponden a hombres con media de 60 años. La oxigenación valorada mediante PaO2 (76 a 98 mmHg, p 0,05) y PaO2/FIO2 (100 a 161, p 0,05) muestra un incremento significativo durante la primera hora de tratamiento con estabilidad de los valores más allá de las 48 horas posteriores al prono. Los parámetros de mecánica pulmonar se mantienen constantes y dentro de rangos protectores (p = 0,18). Conclusión La estrategia de ventilación mecánica protectora y decúbito prono igual o mayor a 48 horas, en sujetos con SDRA moderado a severo secundario a COVID-19, mejora y mantiene la oxigenación hasta 48 horas después de la supinación.

Gastrointestinal symptoms and complications in patients hospitalized due to COVID-19, an international multicentre prospective cohort study (TIVURON project).

BACKGROUND: Retrospective studies suggest that coronavirus disease (COVID-19) commonly involves gastrointestinal (GI) symptoms and complications. Our aim was to prospectively evaluate GI manifestations in patients hospitalized for COVID-19. METHODS: This international multicentre prospective cohort study recruited COVID-19 patients hospitalized at 31 centres in Spain, Mexico, Chile, and Poland, between May and September 2020. Patients were followed-up until 15 days post-discharge and completed comprehensive questionnaires assessing GI symptoms and complications. A descriptive analysis as well as a bivariate and multivariate analysis were performer using binary logistic regression. p<0.05 was considered significant. RESULTS: Eight hundred twenty-nine patients were enrolled; 129 (15.6%) had severe COVID-19, 113 (13.7%) required ICU admission, and 43 (5.2%) died. Upon admission, the most prevalent GI symptoms were anorexia (n=413; 49.8%), diarrhoea (n=327; 39.4%), nausea/vomiting (n=227; 27.4%), and abdominal pain (n=172; 20.7%), which were mild/moderate throughout the disease and resolved during follow-up. One-third of patients exhibited liver injury. Non-severe COVID-19 was associated with ≥2 GI symptoms upon admission (OR 0.679; 95% CI 0.464-0.995; p=0.046) or diarrhoea during hospitalization (OR 0.531; 95% CI 0.328-0.860; p=0.009). Multivariate analysis revealed that worse hospital outcomes were not independently associated with liver injury or GI symptoms. CONCLUSION: GI symptoms were more common than previously documented, and were mild, rapidly resolved, and not independently associated with COVID-19 severity. Liver injury was a frequent complication in hospitalized patients not independently associated with COVID-19 severity.

Five-year follow-up of an interdisciplinary oral health education program: Clinical practice behaviors in working pediatric nurse practitioners.

ABSTRACT: Many interdisciplinary oral health education programs have been implemented for pediatric primary care providers (e.g., pediatric nurse practitioner [PNP]) to raise awareness and gain skills related to the prevention of early childhood caries (ECC). However, no studies have evaluated if these educational programs provided to PNPs during their training resulted in clinical practice behavior changes. A 33-item survey was designed on a web-based platform (Survey Monkey) and distributed to 71 PNP graduates. The survey included demographics, current clinical practice, clinical practice behaviors, and perceived barriers to practice. Descriptive statistics were used to assess the survey items and thematic analyses on the open-ended questions. The survey response rate was 70% (50/71 PNPs). Most practicing PNPs were in acute care or specialty clinics (n = 33; 66%) where oral health was not part of the focused visit. Majority used knowledge learned in assessment and anticipatory guidance skills. However, only 14% of primary care providers were applying fluoride varnish with 10% billing for this procedure. Barriers to application were time, available supplies, COVID protocols, lack of support staff, or not billing due to minimal reimbursement. Many primary care-trained PNPs were practicing in acute or subspecialty areas where prevention of ECC is not viewed as part of their focused visit. Pediatric nurse practitioners working in primary care demonstrated some clinical practice changes. However, areas for improvement are time to perform a risk assessment and application of fluoride varnish, access to these supplies, and standard billing and insurance reimbursement for these preventable services.

Effectiveness of Telemedicine and Teledentistry after the COVID-19 Pandemic.

Telemedicine has become increasingly important worldwide over the last two decades. As a new field, it became known especially during the COVID-19 pandemic; this review presents fields of activity with special attention to opportunities and risks. Numerous areas of application offer the possibility for broad use in the medical and dental care landscape in diagnostics, therapy, rehabilitation, and decision advice across a spatial distance. Technical and semantic standards are required, and profiles and guidelines are increasingly defined and organized. Medical/dental consultations have been established in various regions around the world as a response to pandemic challenges and have made video and online emergency consultations possible. Telemedicine applications are already regularly used in medical/dental emergencies, regardless of the pandemic situation, both for transport by train and by plane, from which patients benefit. However, legal hurdles are often still unresolved, but infrastructure challenges both for provider, user hard- and software also complicate deployment. Problems are particularly prevalent in the absence of necessary internet coverage or among socially disadvantaged and vulnerable groups who cannot afford expensive equipment or do not know how to use the technology. Broad access must be enabled, and hardware and software interfaces and updates must be regularly checked and updated. Telemedicine might also improve access to and delivery of oral and general health care support both for rural and urban areas with low costs. Even though dentistry and many medical specialties are still performed clinically by means of practical/manual examination, there are areas of diagnostics where telemedicine applications can provide good support. Therefore, as conclusions, access, and delivery of telemedicine applications in dentistry and medicine should be expanded and improved to provide access to all population groups.

Hospitalized COVID-19 Patients with Severe Acute Respiratory Syndrome: A Population-Based Registry Analysis to Assess Clinical Findings, Pharmacological Treatment and Survival.

Background and Objectives: One of the most serious clinical outcomes in hospitalized patients with COVID-19 is severe acute respiratory syndrome (SARS). The aim is to analyze pharmacological treatment, survival and the main mortality predictors. Materials and Methods: A real-world data study from COVID-19-hospitalized patients with SARS from 1 March to 31 May 2020 has been carried out. Variables such as hospital length of stay, ventilation type and clinical outcomes have been taken into account. Results: In Castile and Leon, 14.03% of the 7307 in-hospital COVID-19 patients developed SARS, with a mortality rate of 42.53%. SARS prevalence was doubled in males compared to females, and 78.54% had an age of 65 years or more. The most commonly used medicines were antibiotics (89.27%), antimalarials (68.1%) and corticosteroids (55.9%). Survival of patients developing SARS was lower compared to patients without this complication (12 vs. 13 days). The main death predictors were disseminated intravascular coagulation (DIC) (OR: 13.87) and age (>65 years) (OR: 7.35). Conclusions: Patients older than 65 years who develop DIC have a higher probability of hospital death. Tocilizumab and steroids have been linked to a lower incidence of hospital death, being the main treatment for COVID-19 hospitalized patients with SARS.

Diabetes Does Not Increase the Risk of Hospitalization Due to COVID-19 in Patients Aged 50 Years or Older in Primary Care-APHOSDIAB-COVID-19 Multicenter Study.

The purpose of this study was to identify clinical, analytical, and sociodemographic variables associated with the need for hospital admission in people over 50 years infected with SARS-CoV-2 and to assess whether diabetes mellitus conditions the risk of hospitalization. A multicenter case-control study analyzing electronic medical records in patients with COVID-19 from 1 March 2020 to 30 April 2021 was conducted. We included 790 patients: 295 cases admitted to the hospital and 495 controls. Under half (n = 386, 48.8%) were women, and 8.5% were active smokers. The main comorbidities were hypertension (50.5%), dyslipidemia, obesity, and diabetes (37.5%). Multivariable logistic regression showed that hospital admission was associated with age above 65 years (OR from 2.45 to 3.89, ascending with age group); male sex (OR 2.15, 95% CI 1.47-3.15), fever (OR 4.31, 95% CI 2.87-6.47), cough (OR 1.89, 95% CI 1.28-2.80), asthenia/malaise (OR 2.04, 95% CI 1.38-3.03), dyspnea (4.69, 95% CI 3.00-7.33), confusion (OR 8.87, 95% CI 1.68-46.78), and a history of hypertension (OR 1.61, 95% CI 1.08-2.41) or immunosuppression (OR 4.97, 95% CI 1.45-17.09). Diabetes was not associated with increased risk of hospital admission (OR 1.18, 95% CI 0.80-1.72; p = 0.38). Diabetes did not increase the risk of hospital admission in people over 50 years old, but advanced age, male sex, fever, cough, asthenia, dyspnea/confusion, and hypertension or immunosuppression did.

C-Reactive Protein and Serum Albumin Ratio: A Feasible Prognostic Marker in Hospitalized Patients with COVID-19.

(1) Background: C-reactive protein (CRP) and albumin are inflammatory markers. We analyzed the prognostic capacity of serum albumin (SA) and CRP for an outcome comprising mortality, length of stay, ICU admission, and non-invasive mechanical ventilation in hospitalized COVID-19 patients. (2) Methods: We conducted a retrospective cohort study based on the Spanish national SEMI-COVID-19 Registry. Two multivariate logistic models were adjusted for SA, CRP, and their combination. Training and testing samples were used to validate the models. (3) Results: The outcome was present in 41.1% of the 3471 participants, who had lower SA (mean [SD], 3.5 [0.6] g/dL vs. 3.8 [0.5] g/dL; p < 0.001) and higher CRP (108.9 [96.5] mg/L vs. 70.6 [70.3] mg/L; p < 0.001). In the adjusted multivariate model, both were associated with poorer evolution: SA, OR 0.674 (95% CI, 0.551-0.826; p < 0.001); CRP, OR 1.002 (95% CI, 1.001-1.004; p = 0.003). The CRP/SA model had a similar predictive capacity (honest AUC, 0.8135 [0.7865-0.8405]), with a continuously increasing risk and cutoff value of 25 showing the highest predictive capacity (OR, 1.470; 95% CI, 1.188-1.819; p < 0.001). (4) Conclusions: SA and CRP are good independent predictors of patients hospitalized with COVID-19. For the CRP/SA ratio value, 25 is the cutoff for poor clinical course.

Hospitalized COVID-19 Patients with Severe Acute Respiratory Syndrome: A Population-Based Registry Analysis to Assess Clinical Findings, Pharmacological Treatment and Survival

Background and Objectives: One of the most serious clinical outcomes in hospitalized patients with COVID-19 is severe acute respiratory syndrome (SARS). The aim is to analyze pharmacological treatment, survival and the main mortality predictors. Materials and Methods: A real-world data study from COVID-19-hospitalized patients with SARS from 1 March to 31 May 2020 has been carried out. Variables such as hospital length of stay, ventilation type and clinical outcomes have been taken into account. Results: In Castile and Leon, 14.03% of the 7307 in-hospital COVID-19 patients developed SARS, with a mortality rate of 42.53%. SARS prevalence was doubled in males compared to females, and 78.54% had an age of 65 years or more. The most commonly used medicines were antibiotics (89.27%), antimalarials (68.1%) and corticosteroids (55.9%). Survival of patients developing SARS was lower compared to patients without this complication (12 vs. 13 days). The main death predictors were disseminated intravascular coagulation (DIC) (OR: 13.87) and age (>65 years) (OR: 7.35). Conclusions: Patients older than 65 years who develop DIC have a higher probability of hospital death. Tocilizumab and steroids have been linked to a lower incidence of hospital death, being the main treatment for COVID-19 hospitalized patients with SARS.

COVID-19 Impact on Community-Based Participatory Randomized Controlled Trials-Lessons From the Oral Health Disparities in Children Consortium.

The COVID-19 pandemic has had a major impact on nearly every sector of science and industry worldwide, including a significant disruption to clinical trials and dentistry. From the beginning of the pandemic, dental care was considered high risk for viral transmission due to frequent aerosol-generating procedures. This resulted in special challenges for dental providers, oral health care workers, patients, and oral health researchers. By describing the effect that the COVID-19 pandemic had on four community-based randomized clinical trials in the Oral Health Disparities in Children (OHDC) Consortium, we highlight major challenges so researchers can anticipate impacts from any future disruptions.

Nutritional and Functional Impact of Acute SARS-CoV-2 Infection in Hospitalized Patients.

AIM: To assess the prevalence of malnutrition, frailty, and sarcopenia and the relationships between them in patients hospitalized for COVID-19. METHODS: This was a cross-sectional study of the prevalence, determinants, and associations between malnutrition (GLIM 2019 criteria), sarcopenia (SARC-F scale, dynamometry, and calf circumference), and frailty (FRAIL scale) upon discharge following hospitalization for COVID 19. RESULTS: A total of 101 patients (67.3% men, mean age 66.3 years) were recruited. Malnutrition was diagnosed in 49.5%, sarcopenia in 32.7%, and frailty in 28.7% of patients. Of the patients with malnutrition, 48% were also sarcopenic, and 42% were frail. There was a significant association between malnutrition and the severity of pneumonia according to the CURB-65 scale (odds ratio [OR] 2.61, p = 0.036), between sarcopenia and a Barthel score lower than 60 points (OR 29.52, p < 0.001), and between frailty and both a Barthel score lower than 60 points (OR 32.27, p < 0.001) and a length of hospital stay of over 30 days (OR 9.11, p = 0.008). CONCLUSIONS: Malnutrition, sarcopenia, and frailty are prevalent and interrelated entities in patients hospitalized for acute SARS CoV-2 infection, especially in patients with greater baseline functional impairment prior to admission and a higher infection severity.

Unexpected benefits of and lessons learned from shifting to virtual focus group discussions in the BEECON trial.

OBJECTIVE: The COVID-19 pandemic has forced many human subjects research to halt in-person activities and pivot to virtual engagement, including Focus Groups (FGs). We highlight learnings from our experience of hosting virtual FGs from our BEhavioral EConomics for Oral health iNnovation (BEECON) study focusing on oral hygiene behaviors among low-income, predominantly Hispanic families, including practical tips and potential pitfalls to avoid for researchers considering virtual engagement. RESULTS: There can be particular benefits to holding virtual sessions among minority parents of young children-to provide flexibility, comfort, and reduced logistical barriers for participation-while still facilitating friendly conversation with minimal distractions. However, extensive preparation is needed to ensure smooth execution and minimal distractions.

Improved oral health knowledge in a primary care pediatric nurse practitioner program.

ABSTRACT: Pediatric nurse practitioners (PNPs) are a significant workforce in primary care and are uniquely positioned to improve oral health in children through ongoing surveillance in the well-child visit. The purpose of this study was to evaluate PNP student satisfaction and knowledge gained with the integration of the Strategic Partnership for Interprofessional Collaborative Education in Pediatric Dentistry (SPICE-PD) oral health education program into the first-year primary care curriculum. A descriptive, comparative design examined dental test scores across the pre-SPICE-PD (2013-2014; n = 26) and post-SPICE-PD (2015-2020; n = 55) cohorts. An electronic survey was completed (n = 47; 67%), and focus group (n = 12) audio-recordings were analyzed using Atlas.ti 8.0. Chi-square test and independent samples t-test were used to assess differences between groups. The SPICE-PD students reported improved knowledge and skill in clinical practice. Focus group themes were oral health education was beneficial, impact of coronavirus disease 2019, and suggestions for improvement. Mean dental test scores improved pre- and post-SPICE-PD (83 vs. 93; p < .001). The SPICE-PD oral health education improved knowledge and was highly satisfying for students. Pediatric nurse practitioners are ideally positioned to integrate oral health into primary care services, thereby improving access to care and ultimately reducing or mitigating early childhood caries. Evaluation of PNP postgraduation practices in the primary care setting is needed to assess whether improved knowledge results in practice change.

Identities and Precariousness in the Collaborative Economy, Neither Wage-Earner, nor Self-Employed: Emergence and Consolidation of the Homo Rider, a Case Study

In recent years, courier and home delivery services have experienced extensive growth around the world. These platform companies, that operate through applications on smartphones, have experienced the benefits of the technological leap that has been produced by the conditions imposed by the COVID-19 pandemic and its restrictions on traditional commerce. This business model integrates novel elements that move away from a classic contractual relationship, employer-employee. They combine a strong cooperative culture, integrated by company values and principles that make the rider assume an identity that defines him/her as a worker and a member of a community. In addition, on the other hand, precarious working conditions, in which extreme competitiveness among colleagues and dependence on high standards of service compliance are encouraged. In Spain, there is a lack of research on the identity of workers in this type of platform. By means of in-depth interviews with drivers of two different companies in the Region of Murcia (Spain), the main objective of this article is to identify and describe the figure of what we define as homo rider, understood as a prototype individual in the context of contemporary labor relations, linked to the incorporation of new technologies for the intermediation and interconnection between people, goods and services. We approach to the socioeconomic spectrum and identity imaginary of the homo rider through two dimensions, material and ideological, to construct this broad, ambiguous figure between self-employment and wage-earner that would also represent a complex relation between precarious work and new technologies.

"I prefer to get coronavirus than to stop working": the street vendor's perspective.

During phase 2 of the COVID-19 pandemic in a Mexican City, informal street vendors (cases) and formal employees (controls) were interviewed. A total of 82.6% of street vendors preferred to expose themselves to the coronavirus than to stop working, compared with 18.4% of formal employees (adjusted OR = 19.4, 95%CI: 4.6-81.7, p < 0.001). Street vendors had 7 times less fear of dying from coronavirus (adjusted OR = 0.14, 95% CI: 0.03-0.5, p = 0.005) and showed a 16-times greater lack of real concern for the increase in cases in their community than the formal employees (adjusted OR = 0.06, 95% CI: 0.01-0.3, p = 0.002). Street vendors were the group with the poorest adherence to household and work area containment measures that continued to be in contact with others. The corresponding authorities must plan specific strategies that allow street vendors to survive economically, while at the same time, protecting community health.

A Population-Based Registry Analysis on Hospitalized COVID-19 Patients with Previous Cardiovascular Disease: Clinical Profile, Treatment, and Predictors of Death.

A high percentage of patients with COVID-19 (coronavirus disease 2019) have previous cardiovascular disease (CVD). The findings presented here came from an epidemiological population-based registry study (real-world data) that enrolled all in-hospital COVID-19 patients with previous CVD from 1 March to 31 May 2020. Death, other comorbidities, hospital stay variables, ventilation type, and main clinical outcomes were evaluated. In Castile and Leon, 35.83% of the 7307 in-hospital COVID-19 patients who participated in this study had previous CVD, particularly arrhythmias (48.97%), cerebrovascular disease (25.02%), ischemic heart disease (22.8%), and chronic heart failure (20.82%). Of the patients, 21.36% were men and more than 90% were over 65 years of age, and the mortality rate achieved 32.93%. The most used medicines were antibiotics (91.41%), antimalarials (73.3%), steroids (46.64%), and antivirals (43.16%). The main predictors of death were age over 65 years (OR: 5), ventilation needs (OR: 2.81), treatment with anti-SIRS (systemic inflammatory response syndrome) medicines (OR: 1.97), antivirals (OR: 1.74) or steroids (OR: 1.68), SIRS (OR: 5.75), SARS (severe acute respiratory syndrome) (OR: 2.44), or AKI (acute kidney injury) (OR: 1.63) occurrence. Chronic heart failure and cerebrovascular disease were associated with a worse clinical course of COVID-19, especially in men older than 65 years with diabetes who developed SIRS, SARS, or AKI.

Phylogenomics and population genomics of SARS-CoV-2 in Mexico during the pre-vaccination stage reveals variants of interest B.1.1.28.4 and B.1.1.222 or B.1.1.519 and the nucleocapsid mutation S194L associated with symptoms.

Understanding the evolution of the SARS-CoV-2 virus in various regions of the world during the Covid-19 pandemic is essential to help mitigate the effects of this devastating disease. We describe the phylogenomic and population genetic patterns of the virus in Mexico during the pre-vaccination stage, including asymptomatic carriers. A real-time quantitative PCR screening and phylogenomic reconstructions directed at sequence/structure analysis of the spike glycoprotein revealed mutation of concern E484K in genomes from central Mexico, in addition to the nationwide prevalence of the imported variant 20C/S:452R (B.1.427/9). Overall, the detected variants in Mexico show spike protein mutations in the N-terminal domain (i.e. R190M), in the receptor-binding motif (i.e. T478K, E484K), within the S1-S2 subdomains (i.e. P681R/H, T732A), and at the basis of the protein, V1176F, raising concerns about the lack of phenotypic and clinical data available for the variants of interest we postulate: 20B/478K.V1 (B.1.1.222 or B.1.1.519) and 20B/P.4 (B.1.1.28.4). Moreover, the population patterns of single nucleotide variants from symptomatic and asymptomatic carriers obtained with a self-sampling scheme confirmed the presence of several fixed variants, and differences in allelic frequencies among localities. We identified the mutation N:S194L of the nucleocapsid protein associated with symptomatic patients. Phylogenetically, this mutation is frequent in Mexican sub-clades. Our results highlight the dual and complementary role of spike and nucleocapsid proteins in adaptive evolution of SARS-CoV-2 to their hosts and provide a baseline for specific follow-up of mutations of concern during the vaccination stage.

Use of MOOCs in Health Care Training: A Descriptive-Exploratory Case Study in the Setting of the COVID-19 Pandemic

This exploratory study is part of the training and innovation project (GID2016-16) of the National University of Distance Education (UNED) in Spain. The current socioeconomic and educational contexts derived from COVID-19 has led university institutions to develop methodological innovations in the teaching-learning process. Among these strengthening measures are the MOOCs, the most appropriate strategy to bring students closer to new digital platforms that favor the acquisition of knowledge. A methodological pluralism, combining quantitative and qualitative perspectives, has been used. The main results of the descriptive analysis compare the data of students enrolled in the MOOC, “Social and Health Care and Social Services in Social Work”, and other related bachelor’s and master’s degree courses during the four years analyzed. One of the conclusions is the emerging possibility of offering university studies that are more in line with the current teleworking market. The development of online methodologies favors the democratization of education, reaching the student body as a whole and universalizing content and learning. Among the main conclusions, it is worth highlighting the degree of satisfaction shown by the students who took advantage of the MOOC, and the training opportunities afforded by MOOC courses, during the time of COVID-19.

Clinical Profile, Pharmacological Treatment, and Predictors of Death Among Hospitalized COVID-19 Patients With Acute Kidney Injury: A Population-Based Registry Analysis.

Introduction: One of the worst clinical outcomes of the coronavirus disease 2019 (COVID-19) pandemic was acute kidney injury (AKI). Methods: This manuscript presents results from a population-based registry study assessing treatment, comorbidities, and predictors of hospital death among COVID-19 patients with AKI from March 1st to May 31th, 2020. Death, oxygen delivery and ventilation, acute dialysis need, use of medications, and various clinical outcomes, in addition to the length of stay in the hospital and intensive care unit (ICU), were evaluated. Results: In Castile and Leon, the largest region of Spain, 10.87% of the patients admitted for COVID-19 (n = 7,307) developed AKI. These patients were known by having hypertension (57.93%), cardiovascular disease (48.99%), diabetes (26.7%) and chronic kidney disease (14.36%), and they used antibiotics (90.43%), antimalarials (60.45%), steroids (48.61%), antivirals (33.38%), anti-systemic inflammatory response syndrome (SIRS) drugs (9.45%), and tocilizumab (8.31%). Mortality among patients with AKI doubled that observed in patients without AKI (46.1 vs. 21.79%). Predictors of hospital death in COVID-19 patients with AKI were ventilation needs (OR = 5.9), treatment with steroids (OR = 1.7) or anti-SIRS (OR = 2.4), severe acute respiratory syndrome (SARS) occurrence (OR = 2.8), and SIRS occurrence (OR = 2.5). Conclusions: Acute kidney injury is a frequent and serious complication among COVID-19 patients, with a very high mortality, that requires more attention by treating physicians, when prescribing medications, by looking for manifestations particular to the disease, such as SARS or SIRS.