covid-19

Brain maturation is measured by the thickness of the cortex. It is known that stress accelerates cortical thinning, which is associated with a higher risk of developing neuropsychiatric disorders. A study published in PNAS analyzes MRI data collected from 160 adolescents before COVID-19 and from 130 of them after the measures implemented during the pandemic. The comparison of brain structure before and after reveals accelerated cortical thinning which, measured in terms of equivalent years of brain development, was 4.2 years in girls and 1.4 years in boys.brain maturity

In 2021, covid-19 replaced stroke as the second leading age-standardised cause of death, with 94 deaths per 100,000 people, says a study published in The Lancet. The pandemic changed the ranking of the five leading causes of death that had remained stable since 1990, according to the study, which is based on data from the Global Burden of Diseases, Injuries, and Risk Factors Study. The study found that life expectancy since 1990 increased by 6.2 years, an increase that slowed during the pandemic.  

A study published in the journal Science has analyzed the set of proteins present in the blood of 113 people with covid-19 and 39 healthy people. According to their results, patients with persistent covid had a higher amount of proteins related to complement activation, a system involved in the inflammatory and immune response. In addition, there was an increase in antibodies against cytomegalovirus and Epstein-Barr virus. According to the authors, "available therapies targeting the terminal complement pathway could offer new treatment strategies for persistent covid."

A study carried out in two hospitals in Denmark has compared the brain health of 120 patients admitted for covid over 18 months with that of other hospitalized patients with similar severity due to pneumonia, heart attack or need for intensive care, as well as with healthy people. The conclusions are that patients with covid worsened with respect to the latter, but did so in a similar way to other hospitalized persons. According to the authors, "although studies are needed to confirm these findings, brain health after covid-19 appears generally comparable to that of other diseases of similar severity."

The Karolinska Institute has awarded the Nobel Prize in Medicine or Physiology to Katalin Karikó and Drew Weissman for their groundbreaking discoveries, which have radically changed our understanding of how mRNA interacts with our immune system, and made it possible to develop vaccines at unprecedented speed during the covid-19 pandemic.

An analysis published in BMJ Evidence-Based Medicine reviews epidemiological research on persistent covid and concludes that many studies overestimate its prevalence due to overly loose definitions, absent or inadequate control groups and other methodological shortcomings.

Any infection can lead to sequelae and SARS-CoV-2 is no exception. However, the lack of rigorous studies has meant that, in 2023, uncertainty about the number of people affected remains high and treatments are scarce.

From May to August 2022, 157,580 deaths were recorded, 20.5% more than in the same months of 2019, before covid. This increase in mortality was mainly among people aged 75 years and older. Of the causes of death directly related to the heat, heat stroke and dehydration stood out. These are some of the provisional data published by the National Statistics Institute (INE) in relation to deaths in 2022. Covid-19 was the most frequent cause of death, with 31,559 people dying, 20% less than in 2021.

We compared semen analyses of 45 patients before and after mild covid-19 infection. We found a significant decrease in sperm volume, sperm concentration, total and progressive motility and vitality after infection, and that these effects may be long-term.

The World Health Organisation (WHO) Emergency Committee met on 4 May to assess whether covid-19 could continue to be considered a health emergency of international concern (PHEIC). The organisation's director general, Tedros Adhanom, has followed its recommendation and ended the emergency declared on 30 January 2020. "It is with great hope that I declare that covid-19 has ended as a global health emergency. However, this does not mean that covid-19 is no longer a threat to global health. Last week, it claimed one life every three minutes, and that's just the deaths we know about," he told a press conference.