Pathogens

• Direct contact transmission occurs when there is physical contact between an infected person and a susceptible person.
• Airborne transmission refers to the spread of infectious agents through droplets that are suspended in the air.
• Indirect contact transmission occurs when a susceptible person comes into contact with a contaminated object or surface.
• measles is an infectious disease of the respiratory system caused by a virus.
• HIV is transmitted by body fluids, often during unprotected sex, but also through cuts and injecting drugs using shared needles.
• Malaria is spread by mosquitos, which carry the Plasmodium protist
•  tobacco mosaic virus is transmitted by contact between plants, either naturally or on the hands of farmers
• Salmonella is spread by eating contaminated food or drinking contaminated water
• HIV can be prevented by abstaining from sexual intercourse with an infected person or using a condom
• Malaria can be prevented by using insecticides and mosquito nets.
• Tobacco mosaic virus can be treated by removing infected leaves and destroying the infected plants
• Measles can be treated by vaccination or antibiotics
• Measles can be prevented by vaccination and by avoiding close contact with people who are infected
• A pathogen is a microorganism that causes a disease. The four main type of pathogens are bacteria, viruses, fungi and protists.
• All types of pathogen have a simple life cycle. They infect a host, reproduce themselves or replicate if it is a virus, spread from their hostand infect other organisms
• Diseases caused by pathogens are called communicable diseases. This means they can be transferred from one person to another
• Viruses are not alive because they do not complete all of the seven life processes
• Protists are a group of microorganisms that have features that belong to animals, plants and fungi