What must happen for a disease to occur?

What must happen for a disease to occur?

Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease, which typically happens in a small proportion of infected people, occurs when the cells in your body are damaged as a result of infection, and signs and symptoms of an illness appear.

Which of the following factors can lead to emergence of a disease?

Several factors contribute to the emergence and re-emergence of infectious diseases, but most can be linked with the increasing number of people living and moving on earth: rapid and intense international travel; overcrowding in cities with poor sanitation; changes in handling and processing of large quantities of food

Which of the following is a small form of toxin producing bacteria carried by ticks that causes Rocky Mountain spotted fever?

It is caused by infection with the bacterium Rickettsia rickettsii (R. rickettsii), which is usually transmitted by a tick bite.

Which of the following is caused by increased production of a yeast like fungus normally present in the vagina group answer choices?

A vaginal yeast infection (vaginal candidiasis) is caused by an overgrowth of a fungus that naturally lives in the vagina, called Candida albicans. This overgrowth triggers irritation, inflammation, itching, and painful discharge. Most women experience a yeast infection sometime during their lifetime.

What causes disease to occur?

Infectious diseases commonly spread through the direct transfer of bacteria, viruses or other germs from one person to another. This can happen when an individual with the bacterium or virus touches, kisses, or coughs or sneezes on someone who isn’t infected.

What 4 conditions must be present in order for an infection to occur?

Source: Places where infectious agents (germs) live (e.g., sinks, surfaces, human skin) Susceptible Person with a way for germs to enter the body. Transmission: a way germs are moved to the susceptible persont.

What are three ways diseases come about?

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  • Spread through the air by droplets.
  • Spread through the air by aerosol.
  • Spread through faeces and then the mouth (faecal-oral spread)
  • Spread by skin or mucous membrane contact.
  • Spread through blood or other body fluids.
  • Other ways of describing how infectious diseases are spread.

What are the factors that may lead to diseases?

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.


What are the factors that increase the spread of disease?

Water, sanitation, food and air quality are vital elements in the transmission of communicable diseases and in the spread of diseases prone to cause epidemics. A number of environmental factors influence the spread of communicable diseases that are prone to cause epidemics. The most important of these are: water supply.

What factors are important in the emergence and spread of emerging viruses?

Human factors are actually the most potent factors driving disease emergence.

  • 3.1. Population growth.
  • 3.2. Urbanization.
  • 3.3. Human population movements.

Why do new diseases emerge?

Reemerging diseases are diseases that reappear after they have been on a significant decline. Reemergence may happen because of a breakdown in public health measures for diseases that were once under control. They can also happen when new strains of known disease-causing organisms appear.

What bacteria causes Rocky Mountain fever?

Rocky Mountain spotted fever is caused by the organism Rickettsia rickettsii. In the United States, this bacterium most often is spread to humans by bites from the American dog tick or the wood tick, depending on the geographic area.

What organism causes tick bite fever?

Tick bite fever is a bacterial infection transmitted by ticks. It is caused by tiny bacterial organisms called rickettsias. They are responsible for a group of diseases called ‘spotted fevers’ that occur in many parts of the world. Wild and domestic animals are also infected, and act as sources of these diseases.

What kind of ticks carry Rocky Mountain spotted fever?

Agent. RMSF is most often transmitted by the American dog tick in the Eastern, Central and Western United States; by the Rocky Mountain wood tick in the Rocky Mountain states; and by the brown dog tick in the Southwestern United States, along the U.S.-Mexico border.

What bacteria causes Rickettsia?

Rickettsial infections are caused by multiple bacteria from the order Rickettsiales and genera Rickettsia, Anaplasma, Ehrlichia, Neorickettsia, Neoehrlichia, and Orientia (Table 4-19).

What causes over production of yeast?

Yeast can also overgrow in warm or humid conditions. An infection can also happen if you have a weak immune system. Taking antibiotics can also cause an overgrowth of yeast. That’s because antibiotics kill the healthy bacteria in your body that normally keep the yeast in balance.

Which fungal infections are caused by a yeast?

Candidiasis is a fungal infection caused by a yeast (a type of fungus) called Candida. Some species of Candida can cause infection in people; the most common is Candida albicans.

Which is the most common cause of opportunistic yeast or fungal infections?

Opportunistic yeast infections are diseases caused by fungi which normally do not lead to disease. Rather they exist as harmless saprophytes on human skin. Opportunistic pathogens are defined as those that develop certain characteristics under suitable conditions. The most common species are C.

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