Malaria: interrupt a vector’s role
| English | 中文 | Pinyin |
|---|---|---|
| protist/ˈprɒtɪst/ | 原生生物 | yuán shēng shēng wù |
| disease vector/dɪˈziːz ˈvektə/ | 传播媒介 | chuán bō méi jiè |
What would explain this observation?
- A mosquito can carry a pathogen without being the pathogen itself. Malaria prevention must address the vector as well as the parasite.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Malaria is caused by a protist 原生生物 pathogen. A mosquito is a vector: it transfers the pathogen between hosts and is involved in its life cycle. Malaria causes recurrent episodes of fever and can be fatal. Preventing mosquito bites, for example with suitable nets, and reducing mosquito breeding are specified methods of control.
- disease vector 传播媒介: An organism that carries a pathogen between hosts; protist: An organism in a diverse group that includes the malaria pathogen.
Which description correctly separates the two organisms?
Distinguish organism roles carefully. The mosquito is an animal carrier, whereas the disease-causing organism is a protist. A net can reduce opportunities for a mosquito to bite a person; removing suitable breeding conditions can reduce the number of vectors. Neither measure should be described as directly killing every protist already inside an infected person.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Distinguish organism roles carefully. The mosquito is an animal carrier, whereas the disease-causing organism is a protist. A net can reduce opportunities for a mosquito to bite a person; removing suitable breeding conditions can reduce the number of vectors. Neither measure should be described as directly killing every protist already inside an infected person.
- Build a paper model connecting infected host, mosquito and another host. Mark which link each proposed control interrupts. Analyse supplied fictional trap counts rather than breeding or handling mosquitoes. School field observations require teacher approval and should avoid exposure to bites or potentially contaminated water.
Which two habits make the investigation or model in this case more defensible?
Build a paper model connecting infected host, mosquito and another host. Mark which link each proposed control interrupts. Analyse supplied fictional trap counts rather than breeding or handling mosquitoes. School field observations require teacher approval and should avoid exposure to bites or potentially contaminated water.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: fictional matched traps catch a mean of 40 mosquitoes before a breeding-site control and 26 after it. The decrease is 14; percentage decrease = 14/40×100 = 35%. Trap counts estimate vector abundance at those sites and times, not the number of human infections or an individual’s risk.
Fictional trap counts fall from 50 to 35. Calculate percentage decrease. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
Fictional trap counts fall from 50 to 35. Calculate percentage decrease.
The result is 30 %. Known: fictional matched traps catch a mean of 40 mosquitoes before a breeding-site control and 26 after it. The decrease is 14; percentage decrease = 14/40×100 = 35%. Trap counts estimate vector abundance at those sites and times, not the number of human infections or an individual’s risk.
Check the conclusion and its limits
- Malaria is not caused by the mosquito itself or by a bacterium. Fewer vectors can reduce transmission opportunities, but a trap result alone does not demonstrate that malaria has been eradicated. Do not infer a safe travel or treatment decision from classroom model data.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
The mosquito itself is the protist that causes malaria. This claim is false: Malaria is not caused by the mosquito itself or by a bacterium. Fewer vectors can reduce transmission opportunities, but a trap result alone does not demonstrate that malaria has been eradicated. Do not infer a safe travel or treatment decision from classroom model data.
Malaria: interrupt a vector’s role: Distinguish organism roles carefully. The mosquito is an animal carrier, whereas the disease-causing organism is a protist. A net can reduce opportunities for a mosquito to bite a person; removing suitable breeding conditions can reduce the number of vectors. Neither measure should be described as directly killing every protist already inside an infected person.
The mosquito itself is the protist that causes malaria.
Malaria is not caused by the mosquito itself or by a bacterium. Fewer vectors can reduce transmission opportunities, but a trap result alone does not demonstrate that malaria has been eradicated. Do not infer a safe travel or treatment decision from classroom model data.
An organism that carries a pathogen between hosts: write the technical term.
disease vector means An organism that carries a pathogen between hosts.