Drugs used to treat infections caused by bacteria and other micro-organisms.
Proteins produced by the body as part of its defence against foreign bacteria or blood cells.
A shift or change in antigens allows them to escape recognition by the body's immune system.
An antigen on a virus surface causes production of antibodies.
This examines the relationship between the size of a population and the likelihood of an epidemic.
A device fitted to a car exhaust system which minimises the emission of harmful gases.
A water-borne disease caused by a bacterium which leads to severe and often fatal diarrhoea.
Something which occurs over time.
A permanent change in the climate over a period of several years - global warming is suggested to be an important cause.
A type of expansion diffusion.The spread of something, for example a disease, by direct contact
Diseases which occur with aging rather than by infection, for example cancer, heart and Alzheimer's diseases
The spread of a phenomenon, for example a disease or an idea.
The permanent presence of a disease (usually an infection) within a population.
An infection rate which has reached a certain predetermined level in relation to the total population.
A scientist who studies epidemiology.
The science of the distribution, occurrence and spread of disease.
The spread of any phenomenon, for example, a disease, by outward movement from a focal point.
Crops which have had their genetic material modified, for example to improve resistance to pests and diseases.
These examine the spread of disease in relation to population growth (by births and by in-migration).
A type of expansion diffusion. The spread of something, for example a disease through a class or group
The production of artificial resistance to disease by a vaccination.
The number of infectious cases occuring divided by the length of time over which they happen.
A disease caused by a virus or parasite which can be transmitted to another host.
Members of a population infected by a particular disease.
A virus which can spread rapidly through different strains produced by antigenic shift.
A particular influenza infection rate in a population (for example, in the UK defined as 400 cases out of every 100,000 GP consultations per week).
A sizeable influenza infection rate worldwide. Twenty million died in the 1919 influenza pandemic.
Different types of the virus produced by changing antigenic shifts, making it highly infectious.
An acute and highly contagious viral disease marked by distinct red spots followed by a rash.
Poisonous gases and vapours thought to infect the air.
A widespread disease outbreak affecting the population of an extensive area of the world.
The changing distribution of infectious diseases;studied in epidemiology.
Members of a population who have recovered from a particular disease and are therefore immune to it.
The spread of any phenomenon, for example, a disease, by outward movement from a shifting focal point.
An injection of a weakened form of a disease or its antigens in order to give immunity to it.
A micro-organism that invades cells and uses cellular mechanisms to create multiple copies of itself.
Graph plotting the course of an infectious disease outbreak or epidemic over time.