For many years it was widely believed that the first variants of infectious bronchitis virus (IBV) occurred in the early 1950s as Jungherr et al. (1956) in the USA showed that the Connecticut (Conn) ...

Once nearly eradicated, the “old man’s disease” is back and suffocating younger miners. Federal cuts risk putting a solution ...

Medically reviewed by Amelia MacIntyre, DO Mucus, a fluid in your upper respiratory system, is usually clear. But a number of health conditions can cause it to turn brown. Also known as brown phlegm ...