My Grandma would have encouraged you to strap a piece of bacon to your chest, or make a vest from brown paper and goose grease (I can actually remember having to be rubbed with goose grease, and it smelled terrible).

If the bronchitis had settled in then you would have, in addition to the goose grease, been given a drink made from an infusion of elderflower leaves, which would have been collected in the spring and dried ready for this very time. (I can also remember being given that, and it tasted terrible). I am sure that the cure was worse than the illness.