On average, the typical American contracts two to three colds per year between September and May, at an estimated cost of around $40 billion to the economy. Effective forms of treating or preventing colds have proven hard to come by, with the majority of over-the-counter medicines yielding modest results; it’s hard to devise a drug that tackles the vast array of viral pathogens that cause them. The need for better respiratory protection during the winter months is clear. It might be found in a practice that dates back thousands of years.
The concept of saline nasal irrigation, or