Q: Is it true that the world is close to eradicating polio? Why not tetanus and other diseases as well?A: There are many potential causes of infectious diseases that can be ‘spread’ or ‘caught’, including bacteria, viruses, fungi, prions and parasites. Infectious diseases can be spread from person to person (such as the flu, mononucleosis, polio, many others), animal to person (such a rabies, some types of flu such as ‘bird flu’, many others), [...]