What can you catch but not throw?

The familiar sensation of a runny nose, sore throat, and persistent cough is often described with a common idiom. This phrase refers to contracting a viral infection that affects the upper respiratory tract. While the word "catch" typically implies seizing or grasping an object, in this context, it means to acquire an illness, specifically the common cold. The origins of this expression can be traced back centuries, reflecting an older belief that exposure to cold weather or drafts directly caused illness. However, modern science has clarified that colds are caused by viruses, not simply by temperature.

The common cold is a highly contagious ailment, primarily caused by rhinoviruses, though over 200 different viruses can be responsible. These microscopic invaders spread easily from person to person through various means. When an infected individual coughs or sneezes, tiny, virus-laden droplets are released into the air, which can then be inhaled by others. Transmission also occurs through direct contact, such as shaking hands with someone who has a cold, or by touching contaminated surfaces like doorknobs and then touching one's own eyes, nose, or mouth.

Once the virus enters the body, it begins to multiply, leading to the onset of symptoms typically within one to three days. These symptoms often include a stuffy or runny nose, a scratchy throat, sneezing, and sometimes a mild headache or slight body aches. The term "catch" aptly describes this process of involuntary acquisition, as we don't choose to get sick; rather, the virus is "caught" from our environment or from others. Unlike a ball or a frisbee, which can be thrown back, a cold is an unwelcome guest that must simply run its course.