The most deadly four infectious diseases worldwide

Find out which are those infectious diseases and look for information on these aspects of them:

1.- Infectious agent

2.- Vector

3.- Symptoms

4.- Mortality rate

5.- Incicidence at present

6.- Prevalence at present (last year, month or week)

Inportant concepts in epidemiology

Define these terms of epidemiology: (don't forget mentioning your source)

1.- Infectious agent

2.- Vector

3.- Prevalence

4.- Incidence

5.- Mortality

6.- Morbidity