Class Notes (809,275)
Canada (493,607)
Health Studies (1,162)
HLTB21H3 (204)

HLTA01 - Lecture 2.docx

2 Pages
Unlock Document

University of Toronto Scarborough
Health Studies
Caroline Barakat

Lecture 2 – Introduction to Plagues  Parasites  Grow, live, feed on a host but does not contribute to host survival  Cannot survive or replicate on their own (live on a host inside the body)  More offspring the greater infection can spread  Microparasite(virus): a collection of genetic material encased in a protein shell, and can only be seen with an electron microscope (virus is smaller than bacteria) and can only reproduce within their hosts  Macroparasite: composed of many cells; cycles through a transmission stage (eggs and larvae) which pass into the external environment (can be seen using naked eye) ex. Fleas and ticks  Transmission, the movement of the parasite from one host to another  Incubation period – interval required for development of a disease (activity occurring but don’t see symptoms yet)  Latent period – seemingly inactive period between exposure to an infection and illness (no activity occur, dormant stage)  Parasite virulence the capacity of a parasite to cause disease (how much harm it can cause to a host)  Zoonotic infections are animal infections that can be transmitted to humans  Host:  Immunity/susceptibility  Genetics  Nutrition  Environment  Living in an environment that promotes exposure (contaminated water)  Agent  Biological, physical, chemical, psychosocial, rate of growth, persistence (all three factors have to be present in order for disease to occur)  Direct transmission – from person to person  Indirect transmission – through a common route/vector  Portals of entry  Dermal – through the skin  Ingestion – through the mouth  Inhalation – during respiration  Aspiration – airway entry  Asymptomatic infection – infection without clinical illness  Transmission can occur without anything stopping it (don’t show symptoms)  Three main types of disease outbreak  Endemic – usual occurrence of a disease within a given geographical area  Epidemic – exceeds the normal rate  Pandemic – worldwide epidemic  Balance=number of people immune/not at risk of disease vs the number of susceptible/at risk of disease
More Less

Related notes for HLTB21H3

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.