Pathogen Transmission and Control Concepts

The video discusses how pathogens spread and the constraints they face. Pathogens that require close contact tend to cause less harm to keep hosts mobile, while those that spread through water or vectors can be more lethal. Interventions like improved sanitation can force pathogens to evolve into milder forms.

Why might a pathogen limit the harm it causes to its host?

• To ensure the host can spread the pathogen to others

• To make the host feel better

• To avoid detection by the immune system

• To increase its own lifespan

What is a major constraint for pathogens that require close contact to spread?

• They must keep the host healthy enough to interact with others

• They can only infect one host at a time

• They need to be airborne

• They require a specific temperature to survive

What is a common trait of pathogens that require close contact for transmission?

• They are always airborne

• They tend to cause severe harm to the host

• They need the host to be mobile and social

• They can survive in extreme temperatures

How can pathogens like cholera spread without the host being mobile?

• Through airborne particles

• Via contaminated water

• Through animal bites

• By direct skin contact

Why can diseases transmitted by insects be more severe?

• Insects can carry multiple diseases at once

• Insects can access hosts regardless of their health

• Insects are immune to the diseases they carry

• Insects can only transmit diseases in tropical areas

What characteristic makes pathogens that linger in the environment more lethal?

• They are always airborne

• They can survive without a host for long periods

• They are resistant to all forms of treatment

• They can mutate rapidly

Why might pathogens that can be transmitted over long distances be more dangerous?

• They are less detectable by the immune system

• They are more resistant to antibiotics

• They can infect more hosts simultaneously

• They tend to be more lethal

How did improved sanitation practices affect the cholera epidemic in South America?

• It forced cholera to evolve into a milder strain

• It stopped the spread of cholera completely

• It made the bacteria more resistant

• It had no effect on the spread of cholera

What is one way to reduce the severity of diseases transmitted by insects?

• Increasing the number of insects

• Using bed nets regularly

• Allowing insects to bite more hosts

• Reducing the use of insect repellents

What is a potential benefit of cleaning up water supplies in relation to disease control?

• It can make waterborne diseases more lethal

• It can help diseases spread faster

• It can turn deadly diseases into milder ones

• It has no impact on disease severity