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Cuba’s vaunted public health system, which boasts more doctors per capita than any other country, has been pushed to the brink in recent months by the arrival of the coronavirus Delta variant. n a country long left relatively unscathed by the global pandemic, doctors are now battling to get their hands on oxygen and drugs, and patients can wait up to 24 hours for a hospital bed. Despite having rolled out its own, home-grown Covid-19 vaccines — Latin America’s first — [...]

The coronavirus variant detected in the northern Brazilian state of Amazonas is twice as contagious and capable of re-infecting those who already had COVID-19, according to a scientific study released on Tuesday. The Sao Paulo Research Foundation said the scientific research group was coordinated by Ester Sabino, an expert on infectious diseases at the University of Sao Paulo, and Nuno Faria, a researcher at Oxford University in Britain. The virus variant was initially detected in [...]

SARS-CoV-2, the virus that causes COVID-19, is capable of infecting brain tissue and affecting the structure of the cortex, a region of the brain responsible for functions such as memory, consciousness, and language, according to a Brazilian study released on Thursday. “We demonstrated for the first time that the SARS-CoV-2 virus infects and replicates in astrocytes and this can decrease the viability of neurons,” said Daniel Martins de Souza, a professor at the Institute of [...]

The Brazilian city of Manaus, which was devastated by the coronavirus pandemic, may have suffered so many infections that its population now benefits from “herd immunity,” according to a preliminary study. Published on the website medRxiv, the study analyzed infection data with mathematical modeling to estimate that 66 percent of the population had antibodies to the new coronavirus in Manaus, where the pandemic’s passage was as fast as it was brutal. That may be sufficiently [...]

Call it a shock discovery: DNA research has revealed two entirely new species of electric eel in the Amazon basin, including one capable of delivering a record-breaking jolt. The findings are evidence, researchers say, of the incredible diversity in the Amazon rainforest — much of it still unknown to science — and illustrate why it is so important to protect a habitat at risk from deforestation, logging and fires. “In spite of all human impact on the Amazon rainforest in the [...]