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1.
Nature ; 583(7816): 437-440, 2020 07.
Article in English | MEDLINE | ID: covidwho-326050

ABSTRACT

In December 2019, coronavirus disease 2019 (COVID-19), which is caused by the new coronavirus severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was identified in Wuhan (Hubei province, China)1; it soon spread across the world. In this ongoing pandemic, public health concerns and the urgent need for effective therapeutic measures require a deep understanding of the epidemiology, transmissibility and pathogenesis of COVID-19. Here we analysed clinical, molecular and immunological data from 326 patients with confirmed SARS-CoV-2 infection in Shanghai. The genomic sequences of SARS-CoV-2, assembled from 112 high-quality samples together with sequences in the Global Initiative on Sharing All Influenza Data (GISAID) dataset, showed a stable evolution and suggested that there were two major lineages with differential exposure history during the early phase of the outbreak in Wuhan. Nevertheless, they exhibited similar virulence and clinical outcomes. Lymphocytopenia, especially reduced CD4+ and CD8+ T cell counts upon hospital admission, was predictive of disease progression. High levels of interleukin (IL)-6 and IL-8 during treatment were observed in patients with severe or critical disease and correlated with decreased lymphocyte count. The determinants of disease severity seemed to stem mostly from host factors such as age and lymphocytopenia (and its associated cytokine storm), whereas viral genetic variation did not significantly affect outcomes.


Subject(s)
Betacoronavirus/genetics , Betacoronavirus/pathogenicity , Coronavirus Infections/immunology , Coronavirus Infections/virology , Host-Pathogen Interactions/immunology , Lymphopenia/virology , Pneumonia, Viral/immunology , Pneumonia, Viral/virology , /virology , Adolescent , Adult , Aged , Aged, 80 and over , Aging , Animals , Asymptomatic Infections/epidemiology , Betacoronavirus/classification , Betacoronavirus/isolation & purification , China/epidemiology , Cohort Studies , Coronavirus Infections/complications , Coronavirus Infections/epidemiology , Critical Illness/epidemiology , Disease Progression , Evolution, Molecular , Female , Genetic Variation , Genome, Viral/genetics , Hospitalization/statistics & numerical data , Humans , Inflammation Mediators/immunology , Interleukin-6/blood , Interleukin-6/immunology , Interleukin-8/blood , Interleukin-8/immunology , Lymphocyte Count , Lymphopenia/complications , Male , Middle Aged , Pandemics , Phylogeny , Pneumonia, Viral/complications , Pneumonia, Viral/epidemiology , T-Lymphocytes/cytology , T-Lymphocytes/immunology , Time Factors , Treatment Outcome , Virulence/genetics , Virus Shedding , Young Adult , Zoonoses/transmission , Zoonoses/virology
2.
Environ Pollut ; 264: 114741, 2020 Sep.
Article in English | MEDLINE | ID: covidwho-176010

ABSTRACT

Wastewater treatment plants (WWTPs) play important roles in water purification but are also important source of aerosols. However, the relationship between aerosol characteristics and wastewater treatment process remains poorly understood. In this study, aerosols were collected over a 24-month period from a WWTP using a modified anaerobic-anoxic-oxic process. The aerated tank (AerT) was characterized by the highest respiratory fraction (RF) concentrations (861-1525 CFU/m3) and proportions (50.76%-65.96%) of aerosol particles. Fourteen core potential pathogens and 15 toxic metal(loid)s were identified in aerosols. Mycobacterium was the genus that aerosolized most easily in fine grid, pre-anoxic tank, and AerT. High wastewater treatment efficiency may increase the emission of RF and core potential pathogens. The median size of activated sludge, richness of core potential pathogens in wastewater, and total suspended particulates were the most influential factors directly related to the RF proportions, core community of potential pathogens, and composition of toxic metal(loid)s in WWTP aerosols, respectively. Relative humidity, temperature, input and removal of biochemical oxygen demand, dissolved oxygen, and mixed liquor suspended solids could also directly or indirectly affect the aerosol characteristics. This study enhances the mechanistic understanding of linking aerosol characteristics to treatment processes and has important implications for targeted manipulation.


Subject(s)
Waste Water , Water Purification , Aerosols , Metals , Sewage , Waste Disposal, Fluid
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