What is the definition of an infectious disease?
What is the definition of an infectious disease?
What are infectious diseases? Infectious diseases are caused by microorganisms such as viruses, bacteria, fungi or parasites and can spread between individuals. What is an infectious disease? Infectious diseases are caused by microorganisms such as viruses? , bacteria?, fungi or parasites?.
Can a person be infected but not have an infectious disease?
When health is not altered, the process is called a subclinical infection. Thus, a person may be infected but not have an infectious disease. This principle is illustrated by the use of vaccines for the prevention of infectious diseases.
Can a microorganism cause an infectious disease?
But sometimes, microorganisms can cause disease. You can also contract infection-causing pathogens or parasites from other people, animals, insects, or contaminated food. Because symptoms and severity often vary, infectious diseases can be challenging to diagnose and treat.
What is the difference between an infection and an infection?
An infection, by contrast, is the invasion of and replication in the body by any of various microbial agents—including bacteria, viruses, fungi, protozoans, and worms—as well as the reaction of tissues to their presence or to the toxins that they produce. When health is not altered, the process is termed a subclinical infection.
What are the categories of infectious diseases?
Classification of infectious diseases. All infectious diseases can be divided into certain groups: intestinal diseases: salmonella, cholera, dysentery, paratyphoid A and B, foodborne diseases, esherihioz, typhoid fever;
What is the most prevalent infectious disease in the world?
According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people — that’s more than one-quarter of the world’s population.
What are the most common contagious diseases?
The top five most contagious infectious diseases include respiratory tract infections such as bronchitis and pneumonia, HIV/AIDS, diarrheal diseases, tuberculosis and malaria. Respiratory tract infections, especially lower respiratory infections such as bronchitis and pneumonia are considered the most contagious and deadly.
What is a highly infectious disease?
List of Common Highly Contagious Diseases Common Cold. Viral agents that produce the common cold include the 110 rhinoviruses, parainfluenza, adenoviruses, echovirusus and respiratory syncytial virus. Influenza. The CDC reports that as many as 20 percent of the people in the United States have the flu every year. Strep Throat. Ringworm. Giardiasis.