Challenges faced by countries limiting the spread of communicable diseases are;
• Lack of vaccination
• Lack of healthy food available
• Decrease of available clean water
Explanation
Communicable diseases are infectious diseases caused by microorganisms like viruses, parasites, bacteria and fungi. The transmission process is by ingesting contaminated food or through bites from insects. Lack of safe drinking water, unsafe food and poor sanitation like inadequate excreta disposal facilities result in diarrhoeal diseases leading to challenges in limiting the spread of infections.
I would say #1 #3 #4 are the most reasonable options. Healthy food doesn't really affect the communication of a disease and ultimately does nothing to change it. Eating French fries isn't going to give you malaria, but an increase in migration of infected animals will. Especially those who are sold illegally or trafficked across borders. And people not taking their vaccinations has caused an increase in illnesses we have gotten rid of years ago, like polio. #3 is also reasonable since people who travel all over the world, even if they don't get sick, might carry foreign illnesses that perhaps other countries don't have vaccinations for and infect others.
