Abdominal aortic aneurysm: New treatment may reduce size; COVID infection may speed growth

The intravenous delivery of immune-modulating cells may someday slow the expansion of bulges in the aorta, known as abdominal aortic aneurysms. A second study found evidence that a COVID-19 infection may promote the enlargement of these dangerous bulges. These preliminary studies were presented at the American Heart Association’s Vascular Discovery: From Genes to Medicine Scientific Sessions 2023. The meeting, held May 10–13, 2023, in Boston, is a premier global exchange of the latest advances in new and emerging scientific research in arteriosclerosis, thrombosis, vascular biology, peripheral vascular disease, vascular surgery and functional genomics.

Understanding immunological memory

Humans encounter innumerable pathogenic bacteria, viruses and other microbes in their day-to-day activities. While infections from some pathogens can be easily cleared by the innate immune system, others can evade this first line of defense and require the highly specific responses of the adaptive immune system. Vaccines are also able to activate the adaptive immune system to create “memory” conferring long-lasting immunity specific to the pathogen. However, research demonstrates that protective immunity developed naturally and through vaccination may weaken over time.

Study: Conspiracy theorists may not always think rationally, but they don’t generally believe contradictory claims

It’s easy to characterize conspiracy theorists as people who will believe just about anything. However, it’s not true that conspiracy theorists commonly believe contradictory conspiracies, such as the claim that Diana, Princess of Wales, did not die in a car accident but instead both was murdered and is still alive after faking her own death. That kind of thinking appears to be nothing more than a statistical artifact, according to Jan-Willem van Prooijen (Vrije Universiteit Amsterdam) in an interview about his research published in in Psychological Science.