Tag: <span>transmission</span>

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WHO does not endorse an immunity passport

The scientific evidence gathered so far does not provide certainty that a person who has contracted the coronavirus, has recovered, and has generated antibodies is protected against a second infection, leaving behind the idea of an immunity passport, according to the World Health Organization (WHO). This is WHO’s reaction to claims by some governments that...

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Nose cells identified as likely COVID-19 entry points

Researchers from the Wellcome Trust Sanger Institute (United States) have identified two specific types of cells in the nose as points of probable initial infection for the COVID-19 coronavirus. In their work, published in the journal Nature Medicine, they have found that goblet and cylindrical cells in the nose have high levels of the input...

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Temperature dependence of COVID-19 transmission

The data for the coronavirus disease in many different countries follow a common pattern: once the number of confirmed cases reaches order 10 there is a very rapid subsequent growth, which is well fit by an exponential behavior. The latter is typically a good approximation for the following couple of weeks and, after this stage...

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Surgical and N95 masks

The rapid global spread of SARS-CoV-2 and the resulting coronavirus disease (COVID-19) pandemic has led to urgent efforts to contain and mitigate transmission, leading to significant and widespread socioeconomic disruption. As of April 3rd 2020, over one million cases have been reported worldwide, as well as over 60,000 deaths, with ongoing spread in most parts...

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COVID-19 outbreak associated with air conditioning in restaurant

A new publication studies what happened in a restaurant and how air conditioning, an ordinary element in any place that serves food, could have helped infect at least nine people with COVID-19. This is the first work to suggest that air conditioning could play a role in COVID-19 transmission. The analyzed date took place on...

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City size and COVID-19 attack rate

The current outbreak of novel coronavirus disease 2019 (COVID-19) poses an unprecedented global health and economic threat to interconnected human societies. Until a vaccine is developed, strategies for controlling the outbreak rely on aggressive social distancing. These measures largely disconnect the social network fabric of human societies, especially in urban areas. A new study estimates...

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Impact of asymptomatic carriers on COVID-19 transmission

Asymptomatic carriers of the virus display no clinical symptoms but are known to be contagious. Recent evidence reveals that this sub-population, as well as persons with mild symptoms, represent a major contributor in the propagation of COVID-19. The asymptomatic sub-population frequently escapes detection by public health surveillance systems. Because of this, the currently accepted estimates...

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Evaluating the effectiveness of social distancing interventions against COVID-19

The term ‘flatten the curve’, originating from the Centers for Disease Control and Prevention (CDC), has been used widely to describe the impact of social distancing interventions. A new study based in a mathematical model ―age-structured Susceptible-Exposed-Infectious-Removed (SEIR) model, to describe the transmission of COVID-19―, to investigate the effectiveness of social distancing interventions lasting six...

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Imperial College predicts that we will be able to go outside one in three months due to the coronavirus

There are two main challenges in assessing the severity of clinical outcomes during an epidemic of a newly emerging infection such as COVID-19. The first one ―surveillance―, is typically biased towards detecting clinically severe cases, particularly at the start of an epidemic when diagnostic capacity is limited (estimates of the proportion of fatal cases), the...