Okay, this is one the points I came across while going through the syllabus under 'Infectious Diseases':
Describe the roles of social, economic and biological factors in the prevention and control of cholera, malaria, TB and HIV/AIDS.
Can anyone explain what is meant by that and what do we need to know?
Thank you in advance!! 
These are not specifically found in the syllabus but you're supposed to know how and where these particular diseases are transmitted. This will help you to answer this question.
I'll take one by one, and i'll try to elaborate a bit.
1.
CholeraYou should know that this disease is transmitted by fecal-oral route and the main mode of transmission is ingestion of contaminated water or food. It is most prevalent in places that lack adequate sanitary conditions.
Social factors : Sensitisation programmes must be launched through out the whole society so as to educate the inhabitants about the mode of transmission and cure of this disease in order that each one of them take precautions.
Economic : The states should provide money to afford the drugs or vaccine required to combat the disease.
Biological : The person should be in good health so that his immune system is effective against the disease.
2.
MalariaYou must know the main preventive measures against malaria are the elimination of the vector mosquito, treatment of infected people, avoidance of the mosquito bite, information for travelers to endemic areas and the use of preventive medicines.
Social factors : Wear long sleeved shirts, take precautionary measures against mosquitoes.
Economic : Funds from the states.
Biological : Effective immune system.
3.
TuberculosisYou should be aware that tuberculosis is highly contagious, transmitted by air route through sneezes and coughs from a person with the active disease. Transmission is common between members of the same family or even in work environments. The disease today has treatment with efficient antibiotics. Generally, the patient receives three different drugs for several months until healing is complete. There are however some strains of multi-resistant TB-bacteria that emerged by mutation and natural selection due to the intense use of antibiotic drugs mainly in hospitals and treatment facilities; in these cases the treatment is more difficult.
Social factors : Again sensitisation programmes to isolate persons affected as the disease is highly contagious by air.
Economic : Funds should be provided by the governement.
Biological : Everyone should be in good health in order to contain e very effective immune system.
4.
HIV/AIDSYou must be aware that HIV (human immunodeficiency virus) is supposed to be transmitted through blood, semen, vaginal secretions and maternal milk.
Social factors : Avoid from having various sex partners.
Economic : Condoms or pills should be readily available.
Biological : Do not risk the life of a baby.
As you can note, most of the factors resemble for most diseases but still you can opt for more appropriate ones according to the diseases' mode of transmission.
