 Common infections like colds and coughs are rarely serious, but they can still knock you out of commission for a few days.  Thanks to modern immunizations, we rarely see large-scale epidemics of deadly diseases such as polio and smallpox anymore.  Everyone -- from teens to seniors -- should learn how to avoid sexually-transmitted diseases (STDs), and how to spot the signs of a problem. Thanks to their developing immune systems, kids get sick a lot. Here's a look at some infections that are more common in children. Bacteria, viruses, and other germs are adapting and evolving all the time, and sometimes we see new diseases emerge.
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