EPIDEMIOLOGY

• is the pattern of occurrences & distribution of diseases, defects & deaths

EPIDEMIC

• Greater than 50% of populations are susceptible or less immune individual
• Greater % of the population is affected by the occurring disease
• Example: Health worker reports that Community Lanting has an epidemic of measles affecting children less than 7 years old
• Total susceptible population: 3000
• Children affected by measles: 1750

ENDEMIC

• The disease occurs regularly, habitually, constantly affecting the population group
• 2 Local Endemic Diseases: where causative agent is available on those places
• Schistosomiasis: Samar, Leyte, Mindoro, Davao
• Malaria: Palawan & Mindanao-reasons why it’s prevalent
• Forested areas
• Surrounded by bodies of water

SPORADIC

• The pattern of occurrence is on & off where:
• On=available causative agent
• Off=no available causative agent
• It’s intermittent (unpredictable) in occurrence
• Disease occurs only if there’s a susceptible host like in rabies

PANDEMIC

• Worldwide, international, universal, global in occurrence like in AIDS, Hepatitis B, PTB, measles, mumps, diphtheria, pneumonia
• SARS is categorized by WHO as an OUTBREAK only because out of 191 nations, 33 countries are reported to have it.