Pathogen A has an ID 50 of 50 particles, pathogen B has an ID 50 of 1,000 particles, and pathogen C has an ID 50 of 1 × 10 6 particles. Which pathogen is most virulent? Answer a. Pathogen A is most virulent. Which of the following choices lists the steps of pathogenesis in the correct order? Answer c.
Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population.
Pathogen A has an ID 50 of 50 particles, pathogen B has an ID 50 of 1,000 particles, and pathogen C has an ID 50 of 1 × 10 6 particles. Which pathogen is most virulent? Answer a.
Infectious diseases can be caused by:Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.Fungi. ... Parasites.
Parasites - Schistosomiasis Although the worms that cause schistosomiasis are not found in the United States, people are infected worldwide. In terms of impact this disease is second only to malaria as the most devastating parasitic disease.
Contact transmission is the most common form of transmitting diseases and virus. There are two types of contact transmission: direct and indirect. Direct contact transmission occurs when there is physical contact between an infected person and a susceptible person.
organisms. Botulism (“BOT-choo-liz-um”) is a rare but serious illness caused by a toxin that attacks the body's nerves and causes difficulty breathing, muscle paralysis, and even death. This toxin is made by Clostridium botulinum and sometimes Clostridium butyricum and Clostridium baratii bacteria.
Recap. Common protozoan infectious diseases include malaria, giardia, and toxoplasmosis. Less common diseases include African trypanosomiasis and Amoebic dysentery. Each condition affects the body differently.
Other diseases and health problems caused by fungiAspergillosis. About. Symptoms. ... Blastomycosis. About. Symptoms. ... Candidiasis. Candida infections of the mouth, throat, and esophagus. Vaginal candidiasis. ... Candida auris.Coccidioidomycosis. About. Symptoms. ... C. neoformans Infection. About. ... C. gattii Infection. ... Fungal Eye Infections. About.More items...
As per records more than 16% of deaths each year are due to infectious diseases and the most infectious being respiratory infections which claim nearly 3.9 million annual deaths. Thus cough and cold caused by the influenza virus that attacks the human respiratory tract.
Common sources of infection Sources, e.g. airborne, blood borne, sexually transmitted, fecal, oral, environment, stagnant water, warm-water systems, animals.
Viral Infections Viruses cause familiar infectious diseases such as the common cold, flu and warts. They also cause severe illnesses such as HIV/AIDS, Ebola, and COVID-19. Viruses are like hijackers. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves.
Bacteria cause many common infections such as pneumonia, wound infections, bloodstream infections (sepsis) and sexually transmitted diseases like gonorrhea, and have also been responsible for several major disease epidemics.
Bacteria (E. coli, Salmonella, Shigella, Campylobacter, Clostridium), viruses ( Norwalk agent, Rotaviruses), and parasites (Giardia, Entamoeba, Ascaris) can all cause disease in the intestines.
Botulinum toxins are ingested through improperly processed food in which the bacteria or the spores survive, then grow and produce the toxins. Though mainly a foodborne intoxication, human botulism can also be caused by intestinal infection with C. botulinum in infants, wound infections, and by inhalation.