Table of contents

1. Introduction to Microbiology3h 22m
2. Disproving Spontaneous Generation1h 18m
3. Chemical Principles of Microbiology3h 38m
4. Water1h 28m
5. Molecules of Microbiology2h 23m
6. Cell Membrane & Transport3h 28m
7. Prokaryotic Cell Structures & Functions5h 52m
8. Eukaryotic Cell Structures & Functions2h 18m
9. Microscopes2h 46m
10. Dynamics of Microbial Growth4h 36m
11. Controlling Microbial Growth4h 10m
12. Microbial Metabolism5h 16m
13. Photosynthesis2h 31m
14. DNA Replication2h 25m
15. Central Dogma & Gene Regulation7h 14m
16. Microbial Genetics4h 44m
17. Biotechnology3h 0m
18. Viruses, Viroids, & Prions4h 56m
19. Innate Immunity7h 15m
20. Adaptive Immunity7h 14m
21. Principles of Disease6h 57m

21. Principles of Disease

Characteristics of Infectious Disease

Microbiology

21. Principles of Disease

Characteristics of Infectious Disease

Previous problemNext problem

Struggling with Microbiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following would be considered a sign of a disease or infection?

Headache.

Pain.

Nausea.

Fever of 39°C (102°F).

Lack of appetite.

All of the following can be signs of disease or infection.

Previous problemNext problem

Verified step by step guidance

Understand the difference between 'signs' and 'symptoms' in the context of disease. Signs are objective evidence of disease that can be observed or measured by others, such as a fever, rash, or elevated blood pressure. Symptoms, on the other hand, are subjective experiences reported by the patient, such as pain, headache, or nausea.

Identify which options are signs and which are symptoms. In this list, headache, pain, and nausea are symptoms because they are subjective experiences reported by the patient.

Recognize that a fever of 39°C (102°F) is a sign because it is an objective measurement that can be observed and verified by others, such as a healthcare provider using a thermometer.

Consider the option 'lack of appetite.' While it is often reported by the patient, it can also be observed by others if it leads to noticeable weight loss or changes in eating behavior, making it a potential sign in some contexts.

Conclude that the correct answer, 'Fever of 39°C (102°F),' is a definitive sign of disease or infection because it is an observable and measurable condition, unlike the other options which are primarily symptoms.