Infectious diseases Archive

Long COVID is the continuation or development of new symptoms three months after the initial infection from SARS-CoV-2 (the virus that causes COVID) without any other explanation. An estimated 6% to 11% of adults who have had COVID have long COVID. Researchers continue to learn about how it affects people and its possible long-term risks. The best protection against long COVID is avoiding COVID infection by getting vaccinated and wearing a mask in crowded areas.

A 2024 study involving more than 149,000 people, middle-aged and older, found that those who had shingles were 20% more likely to notice signs of cognitive decline years later, compared with those who didn't have shingles.

A diagnosis of influenza (flu) was linked to a sixfold risk of heart attack over the following week, according to a 2024 report.

Even if someone has never gotten the flu or COVID—or at least hasn't gotten very sick from them—there still are good reasons to get vaccines that protect against the viruses. Both the flu and COVID viruses can injure the body, making it vulnerable to new major illnesses such as heart, lung, gastrointestinal, or brain disease. But recent solid evidence has shown that vaccines not only reduce the risk of getting the flu and COVID, but also reduce the risk of developing the serious diseases associated with COVID or flu.