The nature of measles complicates prevention efforts; it spreads efficiently and can linger in the air for up to two hours. Even surfaces can harbor the virus, allowing it to infect those who haven't been in direct contact with an infected person. Individuals at risk, especially unvaccinated children and those with weakened immune systems, should consider wearing masks in busy environments, such as airports and airplanes. This precaution not only helps reduce the risk of measles but also offers protection against other airborne illnesses.