In the past few years I've been susceptible to some respiratory symptoms. They usually start with heavy sneezing, then followed by a mild fever, and sometimes my nose will be running. This will last maybe 5 days, and I think on average I've had this once or twice a year. There was also one case of where I thought was bronchitis; I had some trouble breathing, and they did an x-ray and said they didn't really see anything. They gave me antibiotics anyway.