Towards a framework for testing general relativity with extreme-mass-ratio-inspiral observations

Extreme-mass-ratio-inspiral observations from future space-based gravitational-wave detectors such as LISA will enable strong-field tests of general relativity with unprecedented precision, but at prohibitive computational cost if existing statistical techniques are used. In one such test that is currently employed for LIGO black hole binary mergers, generic deviations from relativity are represented by N deformation parameters in a generalized waveform model; the Bayesian evidence for each of its 2N combinatorial submodels is then combined into a posterior odds ratio for modified gravity over relativity in a null-hypothesis test. We adapt and apply this test to a generalized model for extreme-mass-ratio inspirals constructed on deformed black hole spacetimes, and focus our investigation on how computational efficiency can be increased through an evidence-free method of model selection. This method is akin to the algorithm known as product-space Markov chain Monte Carlo, but uses nested sampling and improved error estimates from a rethreading technique. We perform benchmarking and robustness checks for the method, and find order-of-magnitude computational gains over regular nested sampling in the case of synthetic data generated from the null model.AJKC acknowledges support from the Jet Propulsion Laboratory (JPL) Research and Technology Development programme. SH thanks the Science and Technology Facilities Council (STFC) for financial support. CJM acknowledges financial support provided under the European Union’s H2020 ERC Consolidator Grant ‘Matter and strong-field gravity: New frontiers in Einstein’s theory’ grant agreement no. MaGRaTh646597, and networking support by the COST Action CA16104. Parts of this work were performed using the Darwin Supercomputer of the University of Cambridge High Performance Computing Service (http://www.hpc.cam.ac.uk/), provided by Dell Inc. using Strategic Research Infrastructure Funding from the Higher Education Funding Council for England and funding from STFC. Parts of this work were also undertaken on the COSMOS Shared Memory system at DAMTP, University of Cambridge operated on behalf of the STFC DiRAC HPC Facility; this equipment is funded by BIS National E-infrastructure capital grant ST/J005673/1 and STFC grants ST/H008586/1, ST/K00333X/1. Parts of this work were also carried out at JPL, California Institute of Technology, under a contract with the National Aeronautics and Space Administration

Optimising Maintenance Cost by Prioritising Maintenance of Facilities Services in Residential Buildings

Purpose – The paper illustrates the maintenance prioritising for facilities services in high-rise residential buildings in Peninsular Malaysia. Maintenance prioritisation is becoming more prominent in the building maintenance industry due to budget constraints, poor maintenance management and to yield better maintenance performance. Design/methodology/approach – Two main categories with eleven facilities services that require maintenance were identified through extensive literature review. A total of 321 returned questionnaires were analysed to distinguish the relationship between the maintenance priority and cost variance. Semi-structured interviews were then conducted to validate the findings. Findings – The findings revealed that five essential facilities services were significantly correlated to cost variance and a prediction model which examines the probability of over-budget was developed. Meanwhile, the interviews recognised that maintenance prioritisation has impact towards maintenance cost. Research limitations/implications – This research focuses on the maintenance priorities of facilities services and their effects to maintenance cost. However, it is undeniable that the maintenance cost can be affected by other factors, contributing to a lower percentage of the total variance in the prediction model. Thus, it creates research opportunity to study the factors (i.e. manpower, materials, wear and tear, etc.) affecting the variance of maintenance cost. Practical implications – This study is useful to property managers in efforts to enhance the cost performance via appropriate maintenance prioritisation. The essential facilities services should be highly prioritised compared to the value-added facilities services. Originality/value – The paper signifies the importance of maintenance prioritisation. It serves as a guide to plan and execute maintenance planning in a more logical way within budget and time constraints. Keywords: maintenance priority, facilities services, residential, high-rise building, building maintenance, maintenance cos

CMV retinitis in China and SE Asia: the way forward

AIDS-related CMV retinitis is a common clinical problem in patients with advanced HIV/AIDS in China and Southeast Asia. The disease is causing blindness, and current clinical management, commonly characterized by delayed diagnosis and inadequate treatment, results in poor clinical outcomes: 21% - 36% of eyes with CMV retinitis are already blind at the time the diagnosis is first established by an ophthalmologist. CMV retinitis also identifies a group of patients at extraordinary risk of mortality, and the direct or indirect contribution of extra-ocular CMV disease to AIDS-related morbidity and mortality is currently unmeasured and clinically often overlooked. The obvious way to improve clinical management of CMV retinitis is to screen all patients with CD4 counts < 100 cells/μL with indirect ophthalmoscopy at the time they first present for care, and to provide systemic treatment with oral valganciclovir when active CMV retinitis is detected. Treatment of opportunistic infections is an integral part of HIV management, and, with appropriate training and support, CMV retinitis screening and treatment can be managed by the HIV clinicians, like all other opportunistic infections. Access to ophthalmologist has been problematic for HIV patients in China, and although non-ophthalmologists can perform screening, sophisticated ophthalmological skills are required for the management of retinal detachment and immune recovery uveitis, the major complications of CMV retinitis. CMV retinitis has been clinically ignored, in part, because of the perceived complexity and expense of treatment, and this obstacle can be removed by making valganciclovir affordable and widely available. Valganciclovir is an essential drug for developing successful programs for management of CMV retinitis in China and throughout SE Asia

Validation of the diabetes, hypertension and hyperlipidemia (DHL) knowledge instrument in Malaysia

BACKGROUND: Patient's knowledge on diabetes, hypertension and hyperlipidaemia and its medications can be used as one of the outcome measures to assess the effectiveness of educational intervention. To date, no such instrument has been validated in Malaysia. Therefore, the aim of this study was to evaluate the validity and reliability of the Diabetes, Hypertension and Hyperlipidemia (DHL) knowledge instrument for assessing the knowledge of patients with type 2 diabetes in Malaysia. METHODS: A 28-item instrument which comprised of 5 domains: diabetes, hypertension, hyperlipidemia, medications and general issues was designed and tested. One point was given for every correct answer, whilst zero was given for incorrect answers. Scores ranged from 0 to 28, which were then converted into percentage. This was administered to 77 patients with type 2 diabetes in a tertiary hospital, who were on medication(s) for diabetes and who could understand English (patient group), and to 40 pharmacists (professional group). The DHL knowledge instrument was administered again to the patient group after one month. Excluded were patients less than 18 years old. RESULTS: Flesch reading ease was 60, which is satisfactory, while the mean difficulty factor(SD) was 0.74(0.21), indicating that DHL knowledge instrument was moderately easy. Internal consistency of the instrument was good, with Cronbach's alpha = 0.791. The test-retest scores showed no significant difference for 26 out of the 28 items, indicating that the questionnaire has achieved stable reliability. The overall mean(SD) knowledge scores was significantly different between the patient and professional groups 74.35(14.88) versus 93.84(6.47), p < 0.001. This means that the DHL knowledge instrument could differentiate the knowledge levels of participants. The DHL knowledge instrument shows similar psychometric properties as other validated questionnaires. CONCLUSIONS: The DHL knowledge instrument shows good promise to be adopted as an instrument for assessing diabetic patients' knowledge concerning their disease conditions and medications in Malaysia

Complex dynamics of defective interfering baculoviruses during serial passage in insect cells

Defective interfering (DI) viruses are thought to cause oscillations in virus levels, known as the 'Von Magnus effect'. Interference by DI viruses has been proposed to underlie these dynamics, although experimental tests of this idea have not been forthcoming. For the baculoviruses, insect viruses commonly used for the expression of heterologous proteins in insect cells, the molecular mechanisms underlying DI generation have been investigated. However, the dynamics of baculovirus populations harboring DIs have not been studied in detail. In order to address this issue, we used quantitative real-time PCR to determine the levels of helper and DI viruses during 50 serial passages of Autographa californica multiple nucleopolyhedrovirus (AcMNPV) in Sf21 cells. Unexpectedly, the helper and DI viruses changed levels largely in phase, and oscillations were highly irregular, suggesting the presence of chaos. We therefore developed a simple mathematical model of baculovirus-DI dynamics. This theoretical model reproduced patterns qualitatively similar to the experimental data. Although we cannot exclude that experimental variation (noise) plays an important role in generating the observed patterns, the presence of chaos in the model dynamics was confirmed with the computation of the maximal Lyapunov exponent, and a Ruelle-Takens-Newhouse route to chaos was identified at decreasing production of DI viruses, using mutation as a control parameter. Our results contribute to a better understanding of the dynamics of DI baculoviruses, and suggest that changes in virus levels over passages may exhibit chaos.The authors thank Javier Carrera, Just Vlak and Lia Hemerik for helpful discussion. MPZ was supported by a Rubicon Grant from the Netherlands Organization for Scientific Research (NWO, www.nwo.nl) and a 'Juan de la Cierva' postdoctoral contract (JCI-2011-10379) from the Spanish 'Secretaria de Estado de Investigacion, Desarrollo e Innovacion'. JS was supported by the Botin Foundation. SFE was supported by grant BFU2012-30805, also from the Spanish 'Secretaria de Estado de Investigacion, Desarrollo e Innovacion'.Zwart, MP.; Pijlman, G.; Sardanyes Cayuela, J.; Duarte, J.; Januario, C.; Elena Fito, SF. (2013). Complex dynamics of defective interfering baculoviruses during serial passage in insect cells. Journal of Biological Physics. 39(2):327-342. doi:10.1007/s10867-013-9317-9S327342392Von Magnus, P.: Incomplete forms of influenza virus. Adv. Virus. Res. 2, 59–79 (1954)Huang, A.S.: Defective interfering viruses. Annu. Rev. Microbiol. 27, 101–117 (1973)Kool, M., Voncken, J.W., Vanlier, F.L.J., Tramper, J., Vlak, J.M.: Detection and analysis of Autographa californica nuclear polyhedrosis-virus mutants with defective interfering properties. Virology 183, 739–746 (1991)Wickham, T.J., Davis, T., Granados, R.R., Hammer, D.A., Shuler, M.L., Wood, H.A.: Baculovirus defective interfering particles are responsible for variations in recombinant protein-production as a function of multiplicity of infection. Biotechnol. Lett. 13, 483–488 (1991)Pijlman, G.P., van den Born, E., Martens, D.E., Vlak, J.M.: Autographa californica baculoviruses with large genomic deletions are rapidly generated in infected insect cells. Virology 283, 132–138 (2001)Giri, L., Feiss, M.G., Bonning, B.C., Murhammer, D.W.: Production of baculovirus defective interfering particles during serial passage is delayed by removing transposon target sites in fp25k. J. Gen. Virol. 93, 389–399 (2012)King, L.A., Possee, R.D.: The Baculovirus Expression System. University Press, Cambridge (1992)Lee, H.Y., Krell, P.J.: Reiterated DNA fragments in defective genomes of Autographa californica nuclear polyhedrosis virus are competent for AcMNPV-dependent DNA replication. Virology 202, 418–429 (1994)Pijlman, G.P., Dortmans, J., Vermeesch, A.M.G., Yang, K., Martens, D.E., Goldbach, R.W., Vlak, J.M.: Pivotal role of the non-hr origin of DNA replication in the genesis of defective interfering baculoviruses. J. Virol. 76, 5605–5611 (2002)Pijlman, G.P., van Schijndel, J.E., Vlak, J.M.: Spontaneous excision of BAC vector sequences from bacmid-derived baculovirus expression vectors upon passage in insect cells. J. Gen. Virol. 84, 2669–2678 (2003)Pijlman, G.P., Vermeesch, A.M.G., Vlak, J.M.: Cell line-specific accumulation of the baculovirus non-hr origin of DNA replication in infected insect cells. J. Invertebr. Pathol. 84, 214–219 (2003)Roux, L., Simon, A.E., Holland, J.J.: Effects of defective interfering viruses on virus-replication and pathogenesis in vitro and in vivo. Adv. Virus. Res. 40, 181–211 (1991)Grabau, E.A., Holland, J.J.: Analysis of viral and defective-interfering nucleocapsids in acute and persistent infection by Rhadoviruses. J. Gen. Virol. 60, 87–97 (1982)Kawai, A., Matsumoto, S., Tanabe, K.: Characterization of Rabies viruses recovered from persistently infected BHK cells. Virology 67, 520–533 (1975)Roux, L., Holland, J.J.: Viral genome synthesis in BHK-21 cells persistently infected with Sendai virus. Virology 100, 53–64 (1980)Palma, E.L., Huang, A.: Cyclic production of vesicular stomatitis virus cause by defective interfering particles. J. Infect. Dis. 129, 402–410 (1974).Stauffer Thompson, K.A., Yin, J.: Population dynamics of an RNA virus and its defective interfering particles in passage cultures. Virol. J. 7, 257–266 (2010)Szathmáry, E.: Cooperation and defection – playing the field in virus dynamics. J. Theor. Biol. 165, 341–356 (1993)Bangham, C.R.M., Kirkwood, T.B.L.: Defective interfering particles – effects in modulating virus growth and persistence. Virology 179, 821–826 (1990)Kirkwood, T.B.L., Bangham, C.R.M.: Cycles, chaos, and evolution in virus cultures – a model of defective interfering particles. Proc. Natl. Acad. Sci. USA 91, 8685–8689 (1994)De Gooijer, C.D., Koken, R.H.M., van Lier, F.L.J., Kool, M., Vlak, J.M., Tramper, J.: A structured dynamic model for the baculovirus infection process in insect-cell reactor configurations. Biotech. Bioeng. 40, 537–548 (1992)Van Lier, F.L.J., van der Meijs, W.C.J., Grobben, N.G., Olie, R.A., Vlak, J.M., Tramper, J.: Continuous beta-galactosidase production with a recombinant baculovirus insect-cell system in bioreactors. J. Biotechnol. 22, 291–298 (1992)Van Lier, F.L.J., van den Hombergh, J., de Gooijer, C.D., den Boer, M.M., Vlak, J.M., Tramper, J.: Long-term semi-continuous production of recombinant baculovirus protein in a repeated (fed-)batch two-stage reactor system. Enzyme Microb. Technol. 18, 460–466 (1996)Zwart, M.P., Erro, E., van Oers, M.M., de Visser, J.A.G.M., Vlak, J.M.: Low multiplicity of infection in vivo results in purifying selection against baculovirus deletion mutants. J. Gen. Virol. 89, 1220–1224 (2008)Luckow, V.A., Lee, S.C., Barry, G.F., Olins, P.O.: Efficient generation of infectious recombinant baculoviruses by site-specific transposon-mediated insertion of foreign genes into a baculovirus genome propagated in Escherichia coli. J. Virol. 67, 4566–4579 (1993)Vaughn, J.L., Goodwin, R.H., Tompkins, G.J., McCawley, P.: Establishment of 2 cell lines from insect Spodoptera frugiperda (Lepidoptera, Noctuidae). In Vitro 13, 213–217 (1977)Zwart, M.P., van Oers, M.M., Cory, J.S., van Lent, J.W.M., van der Werf, W., Vlak, J.M.: Development of a quantitative real-time PCR for determination of genotype frequencies for studies in baculovirus population biology. J. Virol. Meth. 148, 146–154 (2008)Zwart, M.P., Hemerik, L., Cory, J.S., de Visser, J.A.G.M., Bianchi, F.J.J.A., van Oers, M.M., Vlak, J.M., Hoekstra, R.F., van der Werf, W.: An experimental test of the independent action hypothesis in virus-insect pathosystems. Proc. R. Soc. B 276, 2233–2242 (2009)Olkin, I., Gleser, L.J., Derman, C.: Probability Models and Applications. Macmillan, New York (1994)Parker, T., Chua, L.: Practical Numerical Algorithms for Chaotic Systems. Springer-Verlag, Berlin (1989)Dieci, L., van Vleck, E.S.: Computation of a few Lyapunov exponents for continuous and discrete dynamical systems. J. Appl. Numer. Math. 17, 275–291 (1995)Matsumoto, T., Chua, L.O., Komuro, M.: The double scroll. IEEE Trans. Circuits Syst. 32, 797–818 (1985)Chua, L.O., Komuro, M., Matsumoto, T.: The double scroll family: rigorous proof of chaos. IEEE Trans. Circuits Syst. 33, 1072–1097 (1986)Ramasubramanian, K., Sriram, M.S.: A comparative study of computation of Lyapunov spectra with different algorithms. Phys. D: Nonlin. Phenom. 139, 72–86 (2000)Lee, H.Y., Krell, P.J.: Generation and analysis of defective genomes of Autographa californica nuclear polyhedrosis virus. J. Virol. 66, 4339–4347 (1992)Kovacs, G.R., Choi, J., Guarino, L.A., Summers MD: Functional dissection of the Autographa californica nuclear polyhedrosis virus immediate early 1 transcriptional regulatory protein. J. Virol. 66, 7429–7437 (1992)Legendre, P., Legendre, L.: Numerical Ecology. Elsevier, Amsterdam (1998)Schuster, H.G.: Deterministic Chaos: An Introduction. Wiley-VCH Verlag GmbH & Co. KGaA, Wienheim (2005)Strogatz, S.H.: Nonlinear Dynamics and Chaos: With Applications to Physics, Biology, Chemistry and Engineering. Westview Press, Cambridge (1994)Dennis, B., Desharnais, R.A., Cushing, J.M., Henson, S.M., Constantino, R.F.: Can noise induce chaos? Oikos 102, 329–339 (2003)Crutchfield, J.P., Huberman, B.A.: Fluctuations and the onset of chaos. Phys. Lett. A 77, 407–410 (1980)Crutchfield, J.P., Farmer, J.D.: Fluctuations and simple chaotic dynamics. Phys. Rep. 92, 45–82 (1982

Ceruloplasmin Deficiency Reduces Levels of Iron and BDNF in the Cortex and Striatum of Young Mice and Increases Their Vulnerability to Stroke

Ceruloplasmin (Cp) is an essential ferroxidase that plays important roles in cellular iron trafficking. Previous findings suggest that the proper regulation and subcellular localization of iron are very important in brain cell function and viability. Brain iron dyshomeostasis is observed during normal aging, as well as in several neurodegenerative disorders such as Alzheimer's, Parkinson's and Huntington's diseases, coincident with areas more susceptible to insults. Because of their high metabolic demand and electrical excitability, neurons are particularly vulnerable to ischemic injury and death. We therefore set out to look for abnormalities in the brain of young adult mice that lack Cp. We found that iron levels in the striatum and cerebral cortex of these young animals are significantly lower than wild-type (WT) controls. Also mRNA levels of the neurotrophin brain derived neurotrophic factor (BDNF), known for its role in maintenance of cell viability, were decreased in these brain areas. Chelator-mediated depletion of iron in cultured neural cells resulted in reduced BDNF expression by a posttranscriptional mechanism, suggesting a causal link between low brain iron levels and reduced BDNF expression. When the mice were subjected to middle cerebral artery occlusion, a model of focal ischemic stroke, we found increased brain damage in Cp-deficient mice compared to WT controls. Our data indicate that lack of Cp increases neuronal susceptibility to ischemic injury by a mechanism that may involve reduced levels of iron and BDNF

Transmission of highly virulent community-associated MRSA ST93 and livestock-associated MRSA ST398 between humans and pigs in Australia

Pigs have been recognised as a reservoir of livestock associated methicillin-resistant Staphylococcus aureus (LA-MRSA) in Europe, Asia and North America. However, little is known about the presence and distribution of MRSA in the Australian pig population and pig industry. This study describes the presence, distribution and molecular characteristics of the human adapted Australian CA-MRSA ST93 isolated from pigs, people, and the environment within a piggery. Isolates were subjected to antibiotic susceptibility testing, DNA microarray, whole genome sequencing, multi locus sequence typing, virulence and resistance gene characterization and phylogenetic analysis. MRSA were isolated from 60% (n = 52) of farm workers where 84% of isolates returned ST93 and the rest ST398. Of the thirty-one pig isolates tested further, an equal number of ST398 and ST93 (15 each) and one as ST30-V were identified. Four of six environmental isolates were identified as ST93 and two as ST398. This study has identified for the first time in Australia the occurrence of CA-MRSA ST93 and LA-MRSA ST398 amongst farm workers, pigs, and the farm environment. Comparative genome analysis indicates that ST398 is likely to have been introduced into Australia from Europe or North America. This study also reports the first linezolid resistant MRSA isolated in Australia

Risk factors for breast cancer in postmenopausal Caucasian and Chinese-Canadian women

Abstract Introduction Striking differences exist between countries in the incidence of breast cancer. The causes of these differences are unknown, but because incidence rates change in migrants, they are thought to be due to lifestyle rather than genetic differences. The goal of this cross-sectional study was to examine breast cancer risk factors in populations with different risks for breast cancer. Methods We compared breast cancer risk factors among three groups of postmenopausal Canadian women at substantially different risk of developing breast cancer - Caucasians (N = 413), Chinese women born in the West or who migrated to the West before age 21 (N = 216), and recent Chinese migrants (N = 421). Information on risk factors and dietary acculturation were collected by telephone interviews using questionnaires, and anthropometric measurements were taken at a home visit. Results Compared to Caucasians, recent Chinese migrants weighed on average 14 kg less, were 6 cm shorter, had menarche a year later, were more often parous, less often had a family history of breast cancer or a benign breast biopsy, a higher Chinese dietary score, and a lower Western dietary score. For most of these variables, Western born Chinese and early Chinese migrants had values intermediate between those of Caucasians and recent Chinese migrants. We estimated five-year absolute risks for breast cancer using the Gail Model and found that risk estimates in Caucasians would be reduced by only 11% if they had the risk factor profile of recent Chinese migrants for the risk factors in the Gail Model. Conclusions Our results suggest that in addition to the risk factors in the Gail Model, there likely are other factors that also contribute to the large difference in breast cancer risk between Canada and China

Extracting the abstraction pyramid from complex networks

<p>Abstract</p> <p>Background</p> <p>At present, the organization of system modules is typically limited to either a multilevel hierarchy that describes the "vertical" relationships between modules at different levels (e.g., module A at level two is included in module B at level one), or a single-level graph that represents the "horizontal" relationships among modules (e.g., genetic interactions between module A and module B). Both types of organizations fail to provide a broader and deeper view of the complex systems that arise from an integration of vertical and horizontal relationships.</p> <p>Results</p> <p>We propose a complex network analysis tool, Pyramabs, which was developed to integrate vertical and horizontal relationships and extract information at various granularities to create a pyramid from a complex system of interacting objects. The pyramid depicts the nested structure implied in a complex system, and shows the vertical relationships between abstract networks at different levels. In addition, at each level the abstract network of modules, which are connected by weighted links, represents the modules' horizontal relationships. We first tested Pyramabs on hierarchical random networks to verify its ability to find the module organization pre-embedded in the networks. We later tested it on a protein-protein interaction (PPI) network and a metabolic network. According to Gene Ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG), the vertical relationships identified from the PPI and metabolic pathways correctly characterized the <it>inclusion </it>(i.e., <it>part-of</it>) relationship, and the horizontal relationships provided a good indication of the functional closeness between modules. Our experiments with Pyramabs demonstrated its ability to perform knowledge mining in complex systems.</p> <p>Conclusions</p> <p>Networks are a flexible and convenient method of representing interactions in a complex system, and an increasing amount of information in real-world situations is described by complex networks. We considered the analysis of a complex network as an iterative process for extracting meaningful information at multiple granularities from a system of interacting objects. The quality of the interpretation of the networks depends on the completeness and expressiveness of the extracted knowledge representations. Pyramabs was designed to interpret a complex network through a disclosure of a pyramid of abstractions. The abstraction pyramid is a new knowledge representation that combines vertical and horizontal viewpoints at different degrees of abstraction. Interpretations in this form are more accurate and more meaningful than multilevel dendrograms or single-level graphs. Pyramabs can be accessed at <url>http://140.113.166.165/pyramabs.php/</url>.</p

Chronic widespread musculoskeletal pain, fatigue, depression and disordered sleep in chronic post-SARS syndrome; a case-controlled study

<p>Abstract</p> <p>Background</p> <p>The long term adverse effects of Severe Acute Respiratory Syndrome (SARS), a viral disease, are poorly understood.</p> <p>Methods</p> <p>Sleep physiology, somatic and mood symptoms of 22 Toronto subjects, 21 of whom were healthcare workers, (19 females, 3 males, mean age 46.29 yrs.+/- 11.02) who remained unable to return to their former occupation (mean 19.8 months, range: 13 to 36 months following SARS) were compared to 7 healthy female subjects. Because of their clinical similarities to patients with fibromyalgia syndrome (FMS) these post-SARS subjects were similarly compared to 21 drug free female patients, (mean age 42.4 +/- 11.8 yrs.) who fulfilled criteria for fibromyalgia.</p> <p>Results</p> <p>Chronic post-SARS is characterized by persistent fatigue, diffuse myalgia, weakness, depression, and nonrestorative sleep with associated REM-related apneas/hypopneas, an elevated sleep EEG cyclical alternating pattern, and alpha EEG sleep anomaly. Post- SARS patients had symptoms of pre and post-sleep fatigue and post sleep sleepiness that were similar to the symptoms of patients with FMS, and similar to symptoms of patients with chronic fatigue syndrome. Both post-SARS and FMS groups had sleep instability as indicated by the high sleep EEG cyclical alternating pattern rate. The post-SARS group had a lower rating of the alpha EEG sleep anomaly as compared to the FMS patients. The post-SARS group also reported less pre-sleep and post-sleep musculoskeletal pain symptoms.</p> <p>Conclusions</p> <p>The clinical and sleep features of chronic post-SARS form a syndrome of chronic fatigue, pain, weakness, depression and sleep disturbance, which overlaps with the clinical and sleep features of FMS and chronic fatigue syndrome.</p