"Code Red" and "Code Blue" are both terms that are often used to refer to a cardiopulmonary arrest, but other types of emergencies (for example bomb threats, terrorist activity, child abductions, or mass casualties) may be given "Code" designations too. Colors, numbers, or other designations may follow a "Code" announcement to identify the type of emergency that is occurring.
I wouldn't like to study zoonotic diseases as a veterinary scientist because zoonotic diseases are diseases that is passed from an animal to a human. This could potentially be life threatening which is why I wouldn't want to do that.
