I have it on the authority of a doctor who works with the Center for Disease Control that those are not "recurring" infections, they are actually infections by new viruses--of which there are many circulating.

I am particularly prone to respiratory infections, and when I get them, they tend to hold on for quite some time. As a result, during the years when I was performing I was forced to break many commitments due to illness, and I finally had to stop singing entirely, and performed only as a musician for many years.

The people that I know who sing for a living are obsessive about getting both excercise and rest, are fastidious about diet, and, particularly in flu season, avoid social situations as much as possible. They also have boxes full of remedies and pallitives that they rely on.

In addition to the standard over the counter stuff, homeopathic and herbal remedies have gotten to be very popular because they often seem to work when the other stuff doesn't.

They tend to see doctors who treat performers--