The contagious disease epidemiology includes local and global work on infections that are rising and recurring, detection of diseases, vaccines development and different intrusion methods, role of pathogens in non-communicable diseases (like cardiovascular diseases and cancer), clinical trials, and disease surveillance. Infectious diseases continue to have a enormous effect at the health of groups round the arena from the worldwide tuberculosis and HIV epidemics, to the threat of resistant bacteria, to the mission of rising and new recognized pathogens. All impel the want for new methods to discover such pathogens, to identify their pathogenesis, and to come up with powerful interventions for their prevention and management.