Disease Causative Agents

A toxin is a harmful substance produced by living organisms, such as bacteria, that can cause disease or damage to the host.

A pathogen is any organism or agent (like a virus, bacterium, or fungus) that causes disease in its host.

Rabies is caused by the rabies virus. Thrush is a fungal infection, and strep throat is a bacterial infection.

Yellow fever and malaria, both transmitted by mosquitoes, were major diseases that plagued workers during the construction of the Panama Canal. Efforts led by William C. Gorgas to control mosquito populations were crucial to the canal's completion.

The COVID-19 pandemic, caused by the SARS-CoV-2 virus, emerged in late 2019 and quickly became the most significant global health crisis of recent years. To limit the spread of this airborne virus, public health guidelines recommended or mandated the use of face coverings. Other diseases like cholera, polio, and yellow fever are not the primary reason for widespread mask-wearing today.

Gonorrhoea, Syphilis, and AIDS are all infectious diseases that are primarily transmitted through sexual contact. Gonorrhoea and Syphilis are caused by bacteria, while AIDS is caused by the Human Immunodeficiency Virus (HIV).

The lymphatic system plays a critical role in the body's immune defense by filtering out pathogens like bacteria and viruses. It produces and transports white blood cells, which actively fight infections. Other systems like the digestive or endocrine systems have different primary roles, such as nutrient absorption and hormone regulation.

Consuming a pathogen-contaminated meal can cause pets to shed bacteria like Salmonella or Campylobacter in their feces for up to a week or more, posing a zoonotic risk to humans in the household even if the pet appears healthy.

Bovine Spongiform Encephalopathy (Mad Cow Disease) is a neurodegenerative disease in cattle caused by prions, which are misfolded proteins.

A bacteriophage is a type of virus that specifically infects and replicates within bacteria and archaea.

Tuberculosis is a bacterial infection that primarily attacks the lungs. Rabies affects the nervous system, Diabetes is a metabolic disorder, and AIDS is an immune system condition.

Acute diseases have a rapid onset and short duration. Viral fever is a typical acute illness, whereas Tuberculosis, Asthma, and Cancer are chronic conditions.

Antibodies are proteins produced by the immune system that identify and neutralize pathogens. They act as tags that signal other immune cells to destroy the marked microbe.