Washington: A group of tiny molecules that attack invading viruses is diminished with age and chronic illnesses, according to a study which says this decrease may explain why older individuals are vulnerable to COVID-19.
Researchers, including those from the University of Florida in the US, said microRNAs play a major role in controlling the activity of genes in the body, and are also on the front line when viruses enter cells.
The study, published in the journal Aging and Disease, noted that microRNAs latch onto and cut the RNA of invading viruses. However, with age and some chronic medical conditions, the attacking microRNA numbers dwindle, reducing our ability to respond to viruses, said Carlos M.