97,000 children test positive for COVID-19

97,000 children test positive for COVID-19 as schools eye reopening: At least 97,000 children tested positive for COVID-19 in the final two weeks of July and there's been an estimated 338,000 cases involving kids in the U.S. since the pandemic began, a new report finds.

 

‘Pupils pose little risk of spreading Covid’: A study suggests there is little evidence the virus is transmitted at school, according to a scientist who backs reopening
 

COVID-19 em Portugal

Um olhar sobre a evolução da COVID-19 em Portugal: Tomando como referência a informação divulgada diariamente no Relatório
de Situação COVID-19 da Direção Geral da Saúde, temos até
8 de agosto
de 2020 um total de 52 668 casos confirmados da doença em Portugal.
Destes, 38 511 (ou seja, 73%), já recuperou, havendo um total de 1756
óbitos, o que equivale
a 3.3% do total de infetados.

Face mask study

Face mask study: Researchers determined which masks are the least effective

Does your coronavirus mask work? New study separates the worthy from the worthless: Mandates for mask use in public during the recent COVID-19 pandemic, worsened by
global shortage of commercial supplies, have led to widespread use of homemade
masks and mask alternatives. It is assumed that wearing such masks reduces the
likelihood for an infected person to spread the disease, but many of these mask
designs have not been tested in practice. We have demonstrated a simple optical
measurement method to evaluate the efficacy of masks to reduce the transmission
of respiratory droplets during regular speech. In proof-of-principle studies, we
compared a variety of commonly available mask types and observed that some mask
types approach the performance of standard surgical masks, while some mask
alternatives, such as neck fleece or bandanas, offer very little protection. Our
measurement setup is inexpensive and can be built and operated by non-experts,
allowing for rapid evaluation of mask performance during speech, sneezing, or
coughing.

What Happens to Viral Particles on the Subway

What Happens to Viral Particles on the Subway: Many New Yorkers are avoiding the subway, fearful of jostling with strangers in crowded cars. Masks and social distancing are essential, but good air flow is also key to reducing the risk of exposure to the coronavirus.

Russia’s fast-track coronavirus vaccine draws outrage over safety

Russia’s fast-track coronavirus vaccine draws outrage over safety: Russia’s president Vladimir Putin announced on 11 August that the country’s health regulator had become the world’s first to approve a coronavirus vaccine for widespread use — but scientists worldwide have condemned the decision as dangerously rushed. Russia hasn’t completed large trials to test its safety and efficacy, and rolling out an inadequately vetted vaccine could put at risk people who receive it, researchers say. It could also impede global efforts to develop quality COVID-19 immunizations, they suggest.