The safe application of biosolids to land requires control of disease-causing organisms called ____ and _____, such as mosquitoes and flies, that may carry these organisms.

The safe application of biosolids to land requires control of disease-causing organisms called ____ and _____, such as mosquitoes and flies, that may carry these organisms.

• A. Pathogens and vectors
• B. Bacteria and pests
• C. Viruses and carriers
• D. Germs and insects

Answer: (A)

Controlling disease risk from biosolids hinges on addressing two things: the disease-causing organisms themselves and the organisms that can spread them. Pathogens are the disease-causing organisms—bacteria, viruses, parasites—that may be present in biosolids. Vectors are the organisms that can carry those pathogens to people, animals, or crops, with mosquitoes and flies being classic examples. By focusing on reducing both pathogens and vectors, you minimize the chance of infection or illness spreading from land-applied biosolids. Other options use terms that are too vague or not precise for this context. For instance, calling out bacteria and pests separates one type of pathogen from vague pests, which doesn’t capture the full range of disease-causing organisms. Viruses and carriers mix a specific pathogen type with an undefined carrier term, and germs and insects rely on informal language that doesn’t clearly identify the two critical components. Pathogens and vectors is the precise and comprehensive pairing needed here.

Controlling disease risk from biosolids hinges on addressing two things: the disease-causing organisms themselves and the organisms that can spread them. Pathogens are the disease-causing organisms—bacteria, viruses, parasites—that may be present in biosolids. Vectors are the organisms that can carry those pathogens to people, animals, or crops, with mosquitoes and flies being classic examples. By focusing on reducing both pathogens and vectors, you minimize the chance of infection or illness spreading from land-applied biosolids.

Other options use terms that are too vague or not precise for this context. For instance, calling out bacteria and pests separates one type of pathogen from vague pests, which doesn’t capture the full range of disease-causing organisms. Viruses and carriers mix a specific pathogen type with an undefined carrier term, and germs and insects rely on informal language that doesn’t clearly identify the two critical components. Pathogens and vectors is the precise and comprehensive pairing needed here.