Jump to navigation. The purpose of this discussion is to have students consider the differences between infectious diseases and noninfectious diseases and what determines whether an infectious disease is considered contagious. The discussion should lead to students to considering the primary modes of transmission of infectious agents and contagious diseases.
Students should recognize that infectious diseases are caused by pathogens such as viruses, bacteria, and parasites and can be spread by direct contact or through vectors. Both are caused by infectious agents but only measles can be spread by indirect contact with an infected individual. Food poisoning cannot be "caught" by direct or indirect contact with another person with food poisoning.
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Work from home with us Create questions or review them from home No software required, no contract to sign. Simply apply as teacher, take eligibility test and start working with us. Required desktop or laptop with internet connection. Difference between infectious and non-infectious diseases? Caused due to attack of pathogens 1. Caused by factors other than pathogens 2.
Lyme disease is an example: You can't catch it from someone you're hanging out with or pass in the street. It comes from the bite of an infected tick. Contagious diseases such as the flu, colds, or strep throat spread from person to person in several ways. Tetanus , for example, can cause an infection, but a person with tetanus can't spread it to other people.
The bacteria live in dirt and dust and get inside your body through abrasions like cuts, scrapes, or punctures. While the pathogen can lead to a very serious infection and illness in individuals, it will almost certainly never cause a worldwide pandemic. A communicable disease is a contagious one. The effect is external. If someone catches the illness, they can get sick and spread the pathogen—be it a cold, virus, or some other disease-causing agent—onto the next person.
This can lead to small, isolated outbreaks or full-scale pandemics. An example of this happens each and every year in the United States from roughly October to May: the flu. As influenza viruses are passed from person to person and via contaminated objects, the virus spreads far and wide. For every one person with the flu, another one to two others will likely become infected if they aren't immune. The rate of how fast a pathogen can spread is called the basic reproductive number, or R0 pronounce R-naught , and it depends on a wide variety of factors, including how the microbe travels to new people.
Nature has no shortage of creativity in how pathogens can travel through a population. These are just a few of the most common methods microbes use to spread.
Pathogens that go from one person to another can be transmitted a number of ways, such as through respiratory droplets like coughing or sneezing, sexual activity, contact with blood, or from mother to child during pregnancy, birth, or breastfeeding. Active illness where you're sneezing or coughing a lot can give the microbe more opportunities to spread, but you don't have to have symptoms to be contagious.
You don't even have to be around. Measles, for example, can be transmitted up to four days before you even develop the telltale rash , and the virus can stay in the air for as long as two hours after you have left the room. Some microbes aren't spread from person-to-person, but rather along a more circuitous person-vector-person path. Responsible for millions of illnesses each year, mosquitoes are one of the world's most common vectors.
Malaria , for example, is spread by mosquitoes who become infected after biting someone with the disease, and then they, in turn, pass the parasite onto the next person they bite. The presence of mosquitoes alone isn't enough to spread diseases. They are merely the pass-through.
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