Flu

Adults only really catch flu about twice a decade, suggests study

Adults over the age of 30 only catch flu about twice a decade, a new study suggests. Flu-like illness can be caused by many pathogens, making it difficult to assess how often people are infected by influenza. Researchers analysed blood samples from volunteers in Southern China, looking at antibody levels against nine different influenza strains that circulated from 1968 to …