scholarly journals COVID-19: Recovering estimates of the infected fatality rate during an ongoing pandemic through partial data

Author(s):  
Matteo Villa ◽  
James F. Myers ◽  
Federico Turkheimer

AbstractIn an ongoing epidemic, the case fatality rate is not a reliable estimate of a disease’s severity. This is particularly so when a large share of asymptomatic or pauci-symptomatic patients escape testing, or when overwhelmed healthcare systems are forced to limit testing further to severe cases only. By leveraging data on COVID-19, we propose a novel way to estimate a disease’s infected fatality rate, the true lethality of the disease, in the presence of sparse and partial information. We show that this is feasible when the disease has turned into a pandemic and data comes from a large number of countries, or regions within countries, as long as testing strategies vary sufficiently. For Italy, our method estimates an IFR of 1.1% (95% CI: 0.2% – 2.1%), which is strongly in line with other methods. At the global level, our method estimates an IFR of 1.6% (95% CI: 1.1% – 2.1%). This method also allows us to show that the IFR varies according to each country’s age structure and healthcare capacity.

2020 ◽  
Author(s):  
Marc SOURIS ◽  
Jean-Paul Gonzalez

When the population risk factors and reporting systems are similar, the assessment of the case-fatality (or lethality) rate (ratio of cases to deaths) represents a perfect tool for analyzing, understanding and improving the overall efficiency of the health system. The objective of this article is to estimate the influence of the hospital care system on lethality in metropolitan France during the inception of the COVID-19 epidemic, by analyzing the spatial variability of the hospital case-fatality rate between French districts (i.e. French departements). The results show that the higher case-fatality rates observed by districts are mostly related to the level of morbidity, therefore to the overwhelming of the healthcare systems during the acute phases of the epidemic. However, the magnitude of this increase of case-fatality rate represents less than 10 per cent of the average case-fatality rate and cannot explain the magnitude of the variations in case-fatality rate reported per country by international organizations or information sites. These differences can only be explained by the systems for reporting cases and deaths, which, indeed, vary greatly from country to country, and not attributed to the care or treatment of patients, even during hospital stress due to epidemic peaks.


Author(s):  
Farid Rahimi ◽  
Amin Talebi Bezmin Abadi

Herd immunity happens when a relatively large proportion of a population becomes infected by an agent, subsequently recovers, and attains immunity against the same agent. That proportion thus indirectly protects the naïve population by preventing the spread of the infection. Herd immunity has been suggested to interrupt and control the COVID-19 pandemic. However, relying on establishing herd immunity can be catastrophic considering the virulence and lethality of SARS-CoV-2. Meanwhile our understanding of the pathogenesis, case-fatality rate, transmission routes, and antiviral therapy for COVID-19 remains limited now. Interrupting or slowing the COVID-19 transmission seems more opportune than vaccination, antiviral therapy, or herd immunity, all of which will take some time to yield. Thus, social distancing, face-masking, and hygiene are the most appropriate immediate countermeasures. Because the social fabrics, economic implications, and local demands of various nations are unique, early relaxation of restrictions may seem hasty particularly when fatality rates are high, or when the healthcare systems could be inadequate or become inundated. Conclusively, avoiding any overwhelmingly risky approach in fighting the pandemic is prudent.


2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Maria Cristina Polidori ◽  
Stefania Maggi ◽  
Francesco Mattace-Raso ◽  
Alberto Pilotto

The world is facing speechless one of the most feared, greatest catastrophes for human beings. Despite better healthcare systems, despite warnings through similar situations and even documented threats, as the COVID-19 pandemic hit, it found us largely unprepared. It offered to us on a silver tray the fragility of mankind. And once again, but this time in a particularly overwhelming way, the most vulnerable part of the world population is mowed down: older persons. Indeed, recent data from the Italian Istituto Superiore di Sanità showed that COVID-19 is more lethal in older subjects: in Italy, at the date of March 17, 2020, the overall case-fatality rate was 7.2% and 96.4% of died patients had more than 60 years. When data were stratified by age groups, individuals aged 70 years or older represent 35.5% of cases, while subjects aged ≥80 years were 52.3%. These data confirm once again that the older generation payed the highest price in time of crisis...


Author(s):  
Jayakrishnan Thayyil ◽  
Thejus Jayakrishnan ◽  
Thomas Bina

The southern state of India-Kerala, where the first coronavirus disease 2019 (COVID-19) cases were reported in the country has come to lime light with its pandemic containing strategies and minimum case fatality rate at hundred days. The state’s unparalleled containment and testing strategies was lauded by the Indian Council of Medical Research (ICMR) and referred to it as the “Kerala model”.


PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261831
Author(s):  
Martin Ackah ◽  
Mohammed Gazali Salifu ◽  
Cynthia Osei Yeboah

Introduction Studies from Sub-Saharan Africa (SSA) countries have reported on the incidence and case fatality rate of children with Traumatic Brain Injury (TBI). However, there is lack of a general epidemiologic description of the phenomenon in this sub-region underpinning the need for an accurate and reliable estimate of incidence and outcome of children (0–18 years) with TBI. This study therefore, extensively reviewed data to reliably estimate incidence, case fatality rate of children with TBI and its mechanism of injury in SSA. Methods Electronic databases were systematically searched in English via Medline (PubMed), Google Scholar, and Africa Journal Online (AJOL). Two independent authors performed an initial screening of studies based on the details found in their titles and abstracts. Studies were assessed for quality/risk of bias using the modified Newcastle-Ottawa Scale (NOS). The pooled case fatality rate and incidence were estimated using DerSimonian and Laird random-effects model (REM). A sub-group and sensitivity analyses were performed. Publication bias was checked by the funnel plot and Egger’s test. Furthermore, trim and fill analysis was used to adjust for publication bias using Duval and Tweedie’s method. Results Thirteen (13) hospital-based articles involving a total of 40685 participants met the inclusion criteria. The pooled case fatality rate for all the included studies in SSA was 8.0%; [95% CI: 3.0%-13.0%], and the approximate case fatality rate was adjusted to 8.2%, [95% CI:3.4%-13.0%], after the trim-and-fill analysis was used to correct for publication bias. A sub-group analysis of sub-region revealed that case fatality rate was 8% [95% CI: 2.0%-13.0%] in East Africa, 1.0% [95% CI: 0.1% -3.0%] in Southern Africa and 18.0% [95% CI: 6.0%-29.0%] in west Africa. The pooled incidence proportion of TBI was 18% [95% CI: 2.0%-33.0%]. The current review showed that Road Traffic Accident (RTA) was the predominant cause of children’s TBI in SSA. It ranged from 19.1% in South Africa to 79.1% in Togo. Conclusion TBI affects 18% of children aged 0 to 18 years, with almost one-tenth dying in SSA. The most common causes of TBI among this population in SSA were RTA and falls. TBI incidence and case fatality rate of people aged 0–18 years could be significantly reduced if novel policies focusing on reducing RTA and falls are introduced and implemented in SSA.


2020 ◽  
Author(s):  
Elham maraghi ◽  
Amal Saki Malehi ◽  
Fakher Rahim

AbstractBackgroundBecause infectious diseases, such as COVID-19, do not have specific boundaries, all countries must prioritize and use the necessary capabilities to prevent, detect, and respond quickly to public health emergencies. In this context, we aimed to review most recent GHS index annual report to observe the regional and global level of health security against COVID-19 outbreak, as well as their relationship with case fatality rate, among 210 countries and territories worldwide.MethodsWe reviewed and analyzed October 2019 GHS index co-leaders joint report, to review health security capacities on the basis of the GHS index in the context of six categories. we prioritized not only the capacities of 210 countries and territories around the world using the GHS Index, but also the existence of functional, tested, proven capabilities for stopping outbreaks at the source. Data were collected from global databases including Worldometer, WHO, and Disease Control and Prevention Center (CDC).FindingsThis study recruited data on 210 countries and territories, of which up to 14 April 2020, 72 countries (34.28%) with more than 1000 total COVID-19 cases were presents. In “most prepared group”, number of total COVID-19 diagnostic tests had a significant positive relation with GHS index (r=0.713; p=0.006). Case fatality rate was directly associated with the detection index (r=0.304; p=0.023) in “more prepared group”. In “Lower-middle-income economies” group, case fatality rate positively related to detection, response and risk environment indices.ImplementationWith the exception of a very small number, countries that were ranked as most prepared countries, they were more likely to be affected by the COVID-19 outbreak of the virus and its health consequences, and needed to seriously reconsider their capabilities and health security in the context of detection, prevention, rapid response, health system facilities, and risk environment against disease outbreakResearch in contextEvidence before this studyGiven the very rapid spread of the COVID-19 disease in a very short time, limited and few studies have shown weakness and strength in national and international capacity to deal with health emergencies. We systematically searched the Scopus, ISI web of science and PubMed from Jan 2019 to April 2020, using the search terms “health security” OR “emergency preparedness” AND “COVID-19” OR “SARS-CoV-2/nCoV-2019”. Our search returned only limited number of published evidences (n=37), of which only one was assessed the operational readiness among 182 countries based on the International Health Regulations (IHR) annual report 1.Added value of this studyGiven a very limited and insufficient on the regional, as well as global preparedness capacities to combat health emergencies, such as COVID-19 disease, we used most recent GHS index annual report (October 2019), to observe the regional and global level of health security in the context of detection, prevention, rapid response, health system facilities, and risk environment against COVID-19 outbreak among 210 countries and territories around the world. We found information about only 195 countries in the recent used report and imputed the data for the rest 15 countries and territories that facing COVID-19 outbreak.Implications of all the available evidenceOur results showed that, with the exception of a very small number of countries that were ranked as most prepared countries, they were more likely to be affected by the COVID-19 outbreak of the virus and its health consequences, and needed to seriously reconsider their capabilities and health security in the context of detection, prevention, rapid response, health system facilities, and risk environment against disease outbreak.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anthony Terriau ◽  
Julien Albertini ◽  
Emmanuel Montassier ◽  
Arthur Poirier ◽  
Quentin Le Bastard

AbstractThe SARS-CoV2 has now spread worldwide causing over four million deaths. Testing strategies are highly variable between countries and their impact on mortality is a major issue. Retrospective multicenter study with a prospective database on all inpatients throughout mainland France. Using fixed effects models, we exploit policy discontinuities at region borders in France to estimate the effect of testing on the case fatality rate. In France, testing policies are determined at a regional level, generating exogenous variation in testing rates between departments on each side of a region border. We compared all contiguous department pairs located on the opposite sides of a region border. The increase of one percentage point in the test rate is associated with a decrease of 0.0015 percentage point in the death rate, that is, for each additional 2000 tests, we could observe three fewer deaths. Our study suggests that COVID-19 population testing could have a significant impact on the mortality rate which should be considered in decision-making. As concern grows over the current second wave of COVID-19, our findings support the implementation of large-scale screening strategies in such epidemic contexts.


2020 ◽  
Author(s):  
Ahmed Youssef Kada

BACKGROUND Covid-19 is an emerging infectious disease like viral zoonosis caused by new coronavirus SARS CoV 2. On December 31, 2019, Wuhan Municipal Health Commission in Hubei province (China) reported cases of pneumonia, the origin of which is a new coronavirus. Rapidly extendable around the world, the World Health Organization (WHO) declares it pandemic on March 11, 2020. This pandemic reaches Algeria on February 25, 2020, date on which the Algerian minister of health, announced the first case of Covid-19, a foreign citizen. From March 1, a cluster is formed in Blida and becomes the epicentre of the coronavirus epidemic in Algeria, its total quarantine is established on March 24, 2020, it will be smoothly alleviated on April 24. A therapeutic protocol based on hydroxychloroquine and azithromycin was put in place on March 23, for complicated cases, it was extended to all the cases confirmed on April 06. OBJECTIVE This study aimed to demonstrate the effectiveness of hydroxychloroquin/azithromycin protocol in Algeria, in particular after its extension to all patients diagnosed COVID-19 positive on RT-PCR test. We were able to illustrate this fact graphically, but not to prove it statistically because the design of our study, indeed in the 7 days which followed generalization of therapeutic protocol, case fatality rate decrease and doubling time increase, thus confirming the impact of wide and early prescription of hydroxychloroquin/azithromycin protocol. METHODS We have analyzed the data collected from press releases and follow-ups published daily by the Ministry of Health, we have studied the possible correlations of these data with certain events or decisions having a possible impact on their development, such as confinement at home and its reduction, the prescription of hydroxychloroquine/azithromycin combination for serious patients and its extension to all positive COVID subjects. Results are presented in graphics, the data collection was closed on 31/05/2020. RESULTS Covid-19 pandemic spreads from February 25, 2020, when a foreign citizen is tested positive, on March 1 a cluster is formed in the city of Blida where sixteen members of the same family are infected during a wedding party. Wilaya of Blida becomes the epicentre of coronavirus epidemic in Algeria and lockdown measures taken, while the number of national cases diagnosed begins to increases In any event, the association of early containment measures combined with a generalized initial treatment for all positive cases, whatever their degree of severity, will have contributed to a reduction in the fatality rate of COVID 19 and a slowing down of its doubling time. CONCLUSIONS In Algeria, the rapid combination of rigorous containment measure at home and early generalized treatment with hydroxychloroquin have demonstrated their effectiveness in terms of morbidity and mortality, the classic measures of social distancing and hygiene will make it possible to perpetuate these results by reducing viral transmission, the only unknown, the reopening procedure which can only be started after being surrounded by precautions aimed at ensuring the understanding of the population. CLINICALTRIAL Algeria, Covid-19, pandemic, hydroxychloroquin, azithromycin, case fatality rate


2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Lei-Ke Zhang ◽  
Yuan Sun ◽  
Haolong Zeng ◽  
Qingxing Wang ◽  
Xiaming Jiang ◽  
...  

A Correction to this paper has been published: https://doi.org/10.1038/s41421-021-00267-0


Sign in / Sign up

Export Citation Format

Share Document