How long is a chest infection infectious for?

A chest infection, such as pneumonia or bronchitis, can be infectious for varying durations depending on the causative agent. Viral infections are usually contagious for about 3 to 7 days, while bacterial infections may remain contagious as long as symptoms are present and until appropriate antibiotics have been taken for at least 24 hours. It's important to practice good hygiene and follow medical advice to prevent spreading the infection.