Infectious Diseases and Immune Response

Infectious diseases are caused by microorganisms like viruses and bacteria. While many microbes are harmless, some are pathogens. Diseases spread through various means, including contact and vectors. The body's normal flora can protect against pathogens but may cause disease if the immune system is weak. Pathogens have virulence factors that help them invade and evade the immune system. Infections trigger inflammation, which can be harmful if excessive. Symptoms vary, with fever being common. Diagnosis involves symptoms and lab tests. Treatments include antibiotics and antivirals, while prevention focuses on hygiene and vaccines.

What are infectious diseases caused by?

• Nutritional deficiencies

• Microorganisms

• Genetic mutations

• Environmental factors

How can infectious diseases be transmitted?

• By reading about them

• By thinking about them

• Through direct contact with an infected person

• Through telepathy

What can cause normal flora to become harmful?

• Lack of sleep

• High sugar intake

• Excessive exercise

• A weakened immune system

What is the role of virulence factors?

• To help pathogens invade host tissues

• To increase the host's energy levels

• To improve the host's immune response

• To reduce the severity of diseases

How do some viruses evade the immune system?

• By remaining dormant inside host cells

• By increasing their size

• By changing their color

• By producing more toxins

What is a potential negative effect of the body's inflammatory response?

• It can cause damage to the body's own tissues

• It can improve the pathogen's virulence

• It can increase the pathogen's growth rate

• It can reduce the effectiveness of antibiotics

What are exotoxins?

• Toxins released by bacteria that cause damage to body systems

• Proteins that help bacteria adhere to host cells

• Enzymes that break down food in the stomach

• Hormones that regulate immune response

What is the most common sign of infection?

• Nausea

• Fever

• Rash

• Headache

What is the primary method to prevent the transmission of infectious diseases?

• Sleeping more

• Exercising regularly

• Eating more fruits

• Practicing personal hygiene

What is the role of vaccines in disease prevention?

• They provide temporary relief

• They increase the severity of diseases

• They are the most effective prevention measures

• They cure diseases