Life Science (Science Olympiad Test)

Epidemic

Definition: A widespread occurrence of an infectious disease in a community or region, exceeding what is normally expected. It often spreads rapidly and affects a large number of people within a short period of time. Examples include the flu, COVID-19, and the Zika virus.

Pandemic

A widespread outbreak of a disease that affects a large population across multiple countries or continents. It can cause high morbidity and mortality rates, leading to significant social and economic disruptions. Examples include the Spanish flu, COVID-19, and the Black Death.

Endemic

A disease that regularly occurs within an area or community

Outbreak

Sudden occurrence of a disease in a specific population or area, spreading rapidly and affecting a large number of individuals.

Agent (Diseases)

A disease-causing organism that can infect and harm a host. It can be a bacteria, virus, fungus, or parasite. This invades the body and causes symptoms and damage, leading to illness. They can spread through direct contact, contaminated food or water, or through vectors like mosquitoes.

Host (disease)

A ___ is an organism that harbors and supports the growth of a pathogen. It can be a human, animal, or plant. The ___ can show symptoms or be asymptomatic.

Vector (Disease)

A ___ transmits diseases from one host to another by biting or feeding on the infected host. Examples of ___ include mosquitoes, ticks, fleas, and flies. They are important in spreading diseases like malaria, dengue fever, Lyme disease, and Zika virus.

Fomite

Object or surface that can carry and transmit infectious agents, such as bacteria or viruses, to individuals. Common examples include doorknobs, cell phones, and money. Proper hand hygiene and regular cleaning of fomites are important in preventing the spread of diseases.

Carrier (disease)

A __ is someone who can transmit a disease without showing symptoms. They can unknowingly spread the disease to others through contact.

Reservoir (Disease)

A ___ is a natural or artificial source where a disease-causing organism can survive, multiply, and potentially infect individuals. It serves as a host for the pathogen, allowing it to persist and spread. ____ can be humans, animals, or environmental elements like water or soil.

Latency Period (Diseases)

Period of time between initial infection and the onset of symptoms in certain diseases.

Incubation Period

The time between exposure to a pathogen and the onset of symptoms is called the ___. It varies depending on the specific disease, ranging from a few hours to several weeks.

Sporadic Transmission

This level indicates isolated cases occurring at irregular intervals. There is no evidence of sustained transmission.

Localized or Clustered Transmission

This level implies an increased number of cases in a defined geographic area, but the spread is still limited to specific groups or communities.

Community Transmission:

This stage signifies that the virus is circulating within the general population, and it may not be possible to trace all cases to a known source.

Widespread Transmission

This indicates a high number of cases occurring in multiple areas, often with an increasing number of outbreaks.

Bioaccumulation

Indicator Species

Keystone Species

Invasive Species